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

	return 0;
}
/**************************************************************
	Problem: 1417
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/