答案

#include <iostream>
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;
}