#include <bits/stdc++.h>
using namespace std;
int main()
    int n,s;
    float n,s
	cin>>n>>s;
	m=(n/4)*(n/4);
	prtintf("%.2f",s;
    cout<<s;
}

/**************************************************************
	Problem: 1420
	User: xuezihong1
	Language: C++
	Result: Compile Error
****************************************************************/