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

/**************************************************************
	Problem: 1417
	User: wangyichen2
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/