#include<bits/stdc++.h>
using namespace std;
#define int long long

int k,l,r,i,ans;

signed main() {
	cin>>k>>l>>r;
	for(i=l;i<=r;i++)
		ans+=i*(i%10==7||i%7==0);
	cout<<ans;
	return 0;
}

怎么调都调不对