#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: caiqiaoxi
	Language: C++
	Result: Compile Error
****************************************************************/