题解在此

#include<iostream>
using namespace std;
int main(){
    long long a;
    cin>>a;
    if (a/7==0){
        switch (a){
            case 1:cout<<"tuesday";break;
            case 2:cout<<"wednesday";break;
            case 3:cout<<"thursday";break;
            case 4:cout<<"friday";break;
            case 5:cout<<"saturday";break;
            case 6:cout<<"sunday";break;
        }
    }else if (a%7==0){
        cout<<"monday";
    }else if (a%7==1){
        cout<<"tuesday";
    }else if (a%7==2){
        cout<<"wednesday";
    }else if (a%7==3){
        cout<<"thursday";
    }else if (a%7==4){
        cout<<"friday";
    }else if (a%7==5){
        cout<<"saturday";
    }else if (a%7==6){
        cout<<"sunday";
    }
    return 0;
}