题解

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

int main(){
    int n;
    cin >> n;
    n = (n + 1) % 7;
    if (n == 1)
        cout << "monday";
    else if (n == 2)
        cout << "tuesday";
    else if (n == 3)
        cout << "wednesday";
    else if (n == 4)
        cout << "thursday";
    else if (n == 5)
        cout << "friday";
    else if (n == 6)
        cout << "saturday";
    else if (n == 0)
        cout << "sunday";
    return 0;
}