#include <bits/stdc++.h>
using namespace std;
int x,y,z;
int main(){
     cin>>x>>y;
     z=y/x*5;
     printf("%d",z);
}
/**************************************************************
	Problem: 1417
	User: chenyichuen
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/