C :

#include<stdio.h>
int main()
{
	int c;
	scanf("%d",&c);
	printf("%.2f",(c*1.0/4)*(c*1.0/4));
	return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int n;
	cin>>n;
	cout<<fixed<<setprecision(2)<<n/4.0*n/4.0<<endl;
}

Pascal :

var
  b,c:real;
  a:longint;
begin
  read(a);
  b:=a/4;
  c:=b*b;
  write(c:0:2);
end.

Java :

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		double a =(double)n/4;
		System.out.println(String.format("%.2f",a*a));
	}
}

Python :

a=int(input())
b=a/4
print("%.2lf"%(b*b))