#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: zhangyilei
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/