#include <stdio.h>

void display_month(int day1, int days);

int main() {
	
	display_month(5, 30);
	display_month(3, 31);
		  
	return (0);
}

/* day1: Sun is 1, Mon is 2, ..., Sat is 7 */
/* days: number of days in month */
void display_month(int day1, int days) {
  int i;
  printf(" Sun Mon Tue Wed Thu Fri Sat\n");
  for (i=1; i<day1; i++)
    printf("    ");   /* spaces before day1 */
  for (i=1; i<=days; i++) {
    printf("%4d", i); /* print day number */
    if ((day1+i-1)%7 == 0) {   /* end of week */
      printf("\n");
    }
  }
  printf("\n\n");
}