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

int main(){
	int x; //星期x
	int n; //天数n
	long long s=0; //游泳路程s 
	cin >>x >>n;
	
	s=(n/7)*1250;
	
	if(x+n%7==7){
		s=s+(n%7-1)*250;
	} else if(x+n%7>=8){
		s=s+(n%7-2)*250;
	} else{
		s=s+(n%7)*250;
	}
	
	cout <<s;
	return 0;
}