#include<bits/stdc++.h>
using namespace std;
inline int fpow(int a,int b){
	int ans=1;
	while (b){
		if (b&1) ans*=a;
		a*=a,b>>=1;
	}
	return ans;
}
bool magic(int x){
    if (x<=10) return x==7;
    int tmp=0,num[10],i=-1;
    while (x) num[++i]=x%10,x/=10;
    for (int j=0;j<i;j++) tmp+=abs(num[j]-num[j+1])*fpow(10,j);
    return magic(tmp);
}
int cnt[2000]={1078,967,644,400,538,212,240,117,194,122,122,194,117,240,212,538,400,644,827,647,387,479,644,400,263,40,129,91,74,80,58,57,52,32,96,28,262,85,552,375,214,164,429,129,538,212,169,52,116,88,80,74,72,46,111,23,122,23,272,111,87,23,225,45,263,40,240,117,96,80,88,116,71,97,73,55,63,26,42,33,61,24,95,31,244,54,169,52,194,122,80,96,91,129,84,84,42,46,30,39,39,30,46,42,84,84,129,91,96,80,122,194,52,169,54,244,31,95,24,61,33,42,26,63,55,73,97,71,116,88,80,96,117,240,40,263,45,225,23,87,111,272,23,122,23,111,46,72,74,80,88,116,52,169,212,538,129,429,164,214,375,552,85,262,28,96,32,52,57,58,80,74,91,129,40,263,400,644,479,387,1405,617,435,319,66,158,20,51,39,47,58,57,71,97,54,244,129,429,827,647,213,413,429,129,91,27,47,34,27,24,13,20,5,14,6,24,77,239,372,1089,387,479,644,400,263,40,129,91,74,80,58,57,52,32,96,28,262,85,552,375,96,14,429,129,85,9,169,52,48,48,37,40,21,27,12,20,7,19,10,50,62,12,225,45,103,13,44,22,53,42,88,116,49,69,33,50,31,24,10,19,36,14,95,31,91,27,40,37,25,25,37,39,32,81,84,84,22,35,15,28,31,13,46,42,73,35,40,39,18,22,19,22,31,13,23,68,27,71,24,61,14,27,26,63,24,45,47,34,18,16,12,11,17,13,17,4,29,51,19,48,15,121,23,122,12,62,32,32,30,21,9,12,16,6,14,10,32,3,15,38,124,365,85,262,11,64,27,34,27,24,5,19,8,5,19,9,104,68,66,13,817,326,435,319,3,44,12,33,26,25,12,24,7,8,11,9,112,117,458,466,122,118,221,19,244,54,69,49,36,33,25,26,11,17,10,33,12,51,79,506,387,479,217,111,263,40,81,32,40,37,24,27,14,21,7,18,13,49,130,245,214,164,429,129,538,212,169,52,116,88,80,74,72,46,111,23,122,23,272,111,48,19,184,10,263,40,71,13,96,80,48,48,34,47,22,27,18,14,7,18,33,14,71,27,244,54,91,35,36,33,42,53,91,129,35,73,23,29,9,29,28,15,35,22,84,84,81,32,39,37,25,25,37,40,27,91,31,95,14,36,26,22,17,52,55,73,69,49,38,22,22,18,18,16,20,9,24,72,12,62,21,135,11,86,23,111,34,42,40,37,16,18,20,7,13,10,21,5,20,35,18,144,20,173,28,96,16,38,36,33,21,30,17,6,20,3,23,12,27,10,178,133,174,141,66,158,9,26,28,30,24,27,10,12,23,5,64,8,199,78,22,3,59,19,91,27,97,71,29,36,30,28,20,15,16,11,6,8,7,7,252,130,71,21,103,13,129,91,52,49,33,36,30,23,7,26,7,32,6,26,96,14,429,129,85,9,169,52,48,48,37,40,21,27,12,20,7,19,10,50,87,23,225,45,263,40,240,117,96,80,88,116,71,97,73,55,63,26,42,33,21,13,59,24,91,27,169,52,32,32,80,96,32,81,49,60,19,23,9,18,29,9,29,23,73,35,129,91,53,42,33,36,35,91,54,244,27,71,14,33,21,14,20,34,24,45,97,71,48,48,37,39,22,37,22,43,10,184,23,87,22,29,11,55,12,62,46,72,52,49,22,38,31,13,9,21,19,28,20,118,5,27,10,50,11,64,32,52,29,36,37,40,26,26,17,4,10,15,11,22,5,19,7,34,3,44,20,51,26,26,33,36,24,32,17,17,32,3,8,8,21,2,28,19,68,23,69,49,57,58,26,26,33,12,19,16,12,4,8,7,153,17,51,13,43,22,81,32,74,80,36,29,34,27,19,13,14,18,7,13,214,164,221,19,69,10,91,35,116,88,49,52,32,32,25,21,12,15,6,48,48,19,184,10,263,40,71,13,96,80,48,48,34,47,22,27,18,14,7,18,61,24,95,31,244,54,169,52,194,122,80,96,91,129,84,84,42,46,30,39,18,9,23,19,60,49,81,32,96,80,32,32,52,169,27,91,24,59,13,21,19,10,24,31,50,33,69,49,116,88,42,53,22,44,13,103,45,225,12,62,17,24,16,33,14,64,34,42,74,80,48,48,37,40,9,24,19,59,14,96,9,14,13,33,19,30,16,38,57,58,49,52,39,40,20,9,12,11,10,42,3,12,4,18,3,50,9,26,39,47,36,29,34,47,31,21,21,5,6,6,6,6,5,21,21,31,47,34,29,36,47,39,26,9,50,3,18,4,12,3,42,10,11,12,9,20,40,39,52,49,58,57,38,16,30,19,33,13,14,9,96,14,59,19,24,9,40,37,48,48,80,74,42,34,64,14,33,16,24,17,62,12,225,45,103,13,44,22,53,42,88,116,49,69,33,50,31,24,10,19,21,13,59,24,91,27,169,52,32,32,80,96,32,81,49,60,19,23,9,18,39,30,46,42,84,84,129,91,96,80,122,194,52,169,54,244,31,95,24,61,18,7,14,18,27,22,47,34,48,48,80,96,13,71,40,263,10,184,19,48,48,6,15,12,21,25,32,32,52,49,88,116,35,91,10,69,19,221,164,214,13,7,18,14,13,19,27,34,29,36,80,74,32,81,22,43,13,51,17,153,7,8,4,12,16,19,12,33,26,26,58,57,49,69,23,68,19,28,2,21,8,8,3,32,17,17,32,24,36,33,26,26,51,20,44,3,34,7,19,5,22,11,15,10,4,17,26,26,40,37,36,29,52,32,64,11,50,10,27,5,118,20,28,19,21,9,13,31,38,22,49,52,72,46,62,12,55,11,29,22,87,23,184,10,43,22,37,22,39,37,48,48,71,97,45,24,34,20,14,21,33,14,71,27,244,54,91,35,36,33,42,53,91,129,35,73,23,29,9,29,18,9,23,19,60,49,81,32,96,80,32,32,52,169,27,91,24,59,13,21,33,42,26,63,55,73,97,71,116,88,80,96,117,240,40,263,45,225,23,87,50,10,19,7,20,12,27,21,40,37,48,48,52,169,9,85,129,429,14,96,26,6,32,7,26,7,23,30,36,33,49,52,91,129,13,103,21,71,130,252,7,7,8,6,11,16,15,20,28,30,36,29,71,97,27,91,19,59,3,22,78,199,8,64,5,23,12,10,27,24,30,28,26,9,158,66,141,174,133,178,10,27,12,23,3,20,6,17,30,21,33,36,38,16,96,28,173,20,144,18,35,20,5,21,10,13,7,20,18,16,37,40,42,34,111,23,86,11,135,21,62,12,72,24,9,20,16,18,18,22,22,38,49,69,73,55,52,17,22,26,36,14,95,31,91,27,40,37,25,25,37,39,32,81,84,84,22,35,15,28,29,9,29,23,73,35,129,91,53,42,33,36,35,91,54,244,27,71,14,33,18,7,14,18,27,22,47,34,48,48,80,96,13,71,40,263,10,184,19,48,111,272,23,122,23,111,46,72,74,80,88,116,52,169,212,538,129,429,164,214,245,130,49,13,18,7,21,14,27,24,37,40,32,81,40,263,111,217,479,387,506,79,51,12,33,10,17,11,26,25,33,36,49,69,54,244,19,221,118,122,466,458,117,112,9,11,8,7,24,12,25,26,33,12,44,3,319,435,326,817,13,66,68,104,9,19,5,8,19,5,24,27,34,27,64,11,262,85,365,124,38,15,3,32,10,14,6,16,12,9,21,30,32,32,62,12,122,23,121,15,48,19,51,29,4,17,13,17,11,12,16,18,34,47,45,24,63,26,27,14,61,24,71,27,68,23,13,31,22,19,22,18,39,40,35,73,42,46,13,31,28,15,35,22,84,84,81,32,39,37,25,25,37,40,27,91,31,95,14,36,19,10,24,31,50,33,69,49,116,88,42,53,22,44,13,103,45,225,12,62,50,10,19,7,20,12,27,21,40,37,48,48,52,169,9,85,129,429,14,96,375,552,85,262,28,96,32,52,57,58,80,74,91,129,40,263,400,644,479,387,1089,372,239,77,24,6,14,5,20,13,24,27,34,47,27,91,129,429,413,213,2979,588,2208,49,72,16,4,2,12,8,13,20,20,15,50,3,141,174,617,1405,98,273,802,204,122,12,2,7,7,2,12,24,30,23,30,19,173,20,552,375,5,52,8,64,31,53,4,10,6,5,5,19,21,27,64,14,86,11,272,111,28,18,13,28,3,20,4,14,3,6,9,12,24,32,33,50,52,17,42,33,36,14,59,24,21,31,7,20,8,13,12,11,26,26,49,60,22,35,30,39,31,13,46,42,73,35,40,39,18,22,19,22,31,13,23,68,27,71,24,61,21,14,20,34,24,45,97,71,48,48,37,39,22,37,22,43,10,184,23,87,48,6,15,12,21,25,32,32,52,49,88,116,35,91,10,69,19,221,164,214,245,130,49,13,18,7,21,14,27,24,37,40,32,81,40,263,111,217,479,387,1405,617,435,319,66,158,20,51,39,47,58,57,71,97,54,244,129,429,827,647};
int main(){
	int l,r,ans=0;
	cin>>l>>r;
	int lpos=l/500000,rpos=r/500000;
	if (lpos==rpos){
		for (int i=l;i<=r;i++) ans+=magic(i);
	}
	else{
		for (int i=lpos+1;i<rpos;i++) ans+=cnt[i];
		for (int i=l;i/500000==l/500000;i++) ans+=magic(i);
		for (int i=r;i/500000==r/500000;i++) ans+=magic(i);
	}
	cout << ans; 
	return 0;
}