题解~

#include<bits/stdc++.h>
using namespace std;
int main() {
	int n,sum=1;
    cin>>n;
    for(int i=1;i<=n;i++){
		sum++;
		if(sum==8){
			sum=1;//一周后回到星期一
		}
	}
	if(sum==1) cout<<"monday";
	if(sum==2) cout<<"tuesday";
	if(sum==3) cout<<"wednesday";
	if(sum==4) cout<<"thursday";
	if(sum==5) cout<<"friday";
	if(sum==6) cout<<"saturday";
	if(sum==7) cout<<"sunday";	
	return 0;
}