Mod

#include <stdio.h>
#include <stdlib.h>

int main(int argc , char *argv[]){
    int  y ,z;
    scanf ("%d",y);
    if (y>=1901 || y<=2013){

        if (y%4==0 || y%400){
            // This says: If the year is divisible by 4 OR the year is not divisible by 400.
            printf ("Tuesday\n");
        }else if(y%100==0){
            printf("Thursday\n");
        }
    }
    return 0;
}