public class Main {
    static long ksm(long a, long b, long mod) {
        long res = 1;
        while (b > 0) {
            if ((b & 1) == 1) {
                res = res * a % mod;
            }
            b = b >> 1;
            a = a * a % mod;
        }
        return res;
    }

    public static void main(String[] args) {
        long day = ksm(20, 22, 7);
        day = (6 + day) % 7;
        if (day == 0) day = 7;
        System.out.println(day);
    }
}

好了，这就是ai