import java.util.Scanner;

public class CheckFermat {

	public static void checkFermat() {

		Scanner in = new Scanner(System.in);
		System.out.print("请按顺序输入正整数a, b, c, n:");
		int a, b, c, n;
                a = in.nextInt();b = in.nextInt();c = in.nextInt();n = in.nextInt();

		if(n > 0 && a > 0 && b > 0 && c > 0){
			if (n != 2 && (Math.pow(a, n) + Math.pow(b, n) == Math.pow(c, n))) {
				System.out.println("老天，费马错了！");
			} else {
				System.out.println("费马是对的~");
			}
		} else {
			System.out.println("输入错误， 请输入正整数！");
		}

		System.out.print("是否继续测试(1/0): ");
		int d = in.nextInt();
		while (d != 0){
			checkFermat();
		}
	}

	public static void main(String[] args) {
		System.out.println("程序开始运行！");
                checkFermat();
                System.out.println("程序运行结束！");
    }
}