#include<bits/stdc++.h>
using namespace std;
int main() {
	int x,y,z;
	scanf("%d %d",x,y);
	z=y/x*5;
	printf("%d",z);
    return 0;
}

/**************************************************************
	Problem: 1417
	User: huangcanwu
	Language: C++
	Result: Runtime Error
****************************************************************/