#include <stdio.h>
int main()
{
    int y,m,d,day;
    static int t[] = {0,3,2,5,0,3,5,1,4,6,2,4};
    static char dayofweek[][10] = {"Sunday","Monday","Tuesday",
                                  "Wednsday","Thursday","Friday","Saturday"};

    printf("year?>");
    scanf("%d",&y);
    printf("month?>");
    scanf("%d",&m);
    printf("day?>");
    scanf("%d",&d);

    y -= m < 3;
    printf("m<3 = %d\n",m<3);
    printf("y = %d\n",y);

    day = (y + y/4 - y/100 + y/400 + t[m-1] + d )%7;
    printf("what day of the week is it today > %s\n",dayofweek[day]);

}