#include <iostream>
using namespace std;

int main() {
	int n, i=2, sum =0;
	cout << "Enter n:";
	cin >>n;
	
	while  (i<=n) {
	 sum= sum + i*i;
	 i +=2;
	}
	  
	 		cout << "Sum of squares of even numbers =" <<sum;
	 
	return 0;	
}