#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y,d;
	cin>>x>>y;
	d=y/x*5;
	printf("%d",d);
}
/**************************************************************
	Problem: 1417
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/