#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y;
	cin>>x>>y;
	y=y/x*5;
	cout<<y;
    return 0;
}
/**************************************************************
	Problem: 1417
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/