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

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