> //PKKU3047 Bovine Birthday
> #include <stdio.h>
> #include <stdlib.h>
> 
> int y,m,d,w,c,a;
> char *weekday[]={"sunday","monday","tuesday","wednesday","thursday","friday","saturday"};
> 
> int main()
> {
>     while (scanf("%d%d%d",&y,&m,&d)!=EOF){
>     a=(14-m)/12;
>     y=y-a;
>     m=m+12*a-2;
>     c=y/100;
>     y=y%100;
>     w=(c/4-2*c+y+y/4+((13*m-1)/5)+d)%7;
>     printf("%s\n",weekday[w]);
>     }
> }