#include <bits/stdc++.h>
using namespace std;

// 返回某个月的天数
int mon(int x) {
    switch (x) {
        case 4: return 30;
        case 5: return 31;
        case 6: return 30;
        case 7: return 31;
        case 8: return 31;
        case 9: return 30;
        case 10: return 31;
        case 11: return 30;
        case 12: return 31;
        default: return 0; // 处理非法输入
    }
}

// 返回星期几的名称
string week(int b) {
    switch (b) {
        case 1: return "Monday";
        case 2: return "Tuesday";
        case 3: return "Wednesday";
        case 4: return "Thursday";
        case 5: return "Friday";
        case 6: return "Saturday";
        case 0: return "Sunday";
        default: return "Invalid day"; // 处理非法输入
    }
}

int main() {
    int m, d;
    cin >> m >> d;

    // 检查输入是否合法
    if (m < 4 || m > 12 || d < 1 || d > 31) {
        cout << "Invalid input!" << endl;
        return 1;
    }

  ...