#include <bits/stdc++.h>
using namespace std;
int main(){
    int x,y,i;
	cin>>x>>y;
	i=y/x*5;
	cout<<i;	
}
/**************************************************************
	Problem: 1417
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/