#include<bits/stdc++.h>
using namespace std;
int main(){
    int x,y;
    cin>>x>>y;
    cout<<y/x*5;
    
	
}

/**************************************************************
	Problem: 1417
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/