别用多分支，那样会很麻烦的

#include<bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin>>n;
    n=(n+1)%7;
    switch(n){
        case 1:cout<<"monday";break;
        case 2:cout<<"tuesday";break;
        case 3:cout<<"wednesday";break;
        case 4:cout<<"thursday";break;
        case 5:cout<<"friday";break;
        case 6:cout<<"saturday";break;
        case 0:cout<<"sunday";break;
    }
    return 0;
}