package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int LeftSight, RightSight, Num;
        System.out.print("Введите натуральное число : ");
        Num = in.nextInt();
        LeftSight = 0;
        RightSight = (Num * (Num + 1) * (2 * Num + 1)) / 6;
        for (int i = 1; i <= Num; i++) {
            LeftSight = LeftSight + i * i;
        }
        if (LeftSight == RightSight) {
            System.out.println("Формула верна");
        }
        else {
            System.out.println("Формула верна только для натуральных чисел");
        }
    }
}