C :

#include <stdio.h>
#include <math.h>
int main(void){
	char month[20][20]={" ","January","February","March","April","May","June","July","August","September","October","November","December"};
	int n,i;
	int day,year;
	char M[20];
	int w,y,c;
	char week[7][10]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
	while (scanf("%d %s %d",&day,M,&year)!=EOF){
	for (i=1; i<13; i++){
		if (strcmp(M,month[i])==0){
			if(i<3){
				year-=1;
				i+=12;
			}
			break;
		}
		}
			c=year/100;
			y=year-100*c;
			w=(int)(c/4)-2*c+(int)(y+y/4)+(int)(13*(i+1)/5)+day-1;
			while(w<0){
				w+=7;
			}
			w=w%7;
			printf("%s\n",week[w]);
	}
	return 0;
}