ZOJ-2405

public class Main{public static void main(String[] args){for (int i = 1000; i < 9999; i++){int tenBase = calc(i, 10);if (tenBase == calc(i, 12) && tenBase == calc(i, 16))System.out.println(i);}}static int calc(int n, int base){int r = 0;while (n != 0){r += n % base;n /= base;}return r;}}