public class Main {

    static int[] arr = {1,2,3,4,5,6,7,8,9};
    static int ans = 0;

    static void f(int k){
        if(k == 9){
            int x1 = arr[0] + arr[1] + arr[3] + arr[5];
            int x2 = arr[0] + arr[2] + arr[4] + arr[8];
            int x3 = arr[5] + arr[6] + arr[7] + arr[8];
            if (x1 == x2 && x2 == x3){
                ans++;
            }
        }
        //对每个位置进行全排列
        for(int i = k; i < 9; i++){
            int t = arr[k];
            arr[k] = arr[i];
            arr[i] = t;
            f(k + 1);
            t = arr[k];
            arr[k] = arr[i];
            arr[i] = t;
        }
    }

    public static void main(String[] args) {
        f(0);
        System.out.println(ans / 6);    //同一个结果旋转可产生三种相同的结果，再镜像，共6种
    }
}