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