Кирилл Деменев

package com.company;

import java.util.Scanner;
import java.util.Random;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int kvadrat = in.nextInt();

        for (int i = 0; i < kvadrat; i++) {
            for (int j = 0; j < kvadrat; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}