#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y;
	cin>>x>>y;
	cout<<y/x*5;
	return 0;
	
} 
/**************************************************************
	Problem: 1417
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/