#include <stdio.h>

int main() {
 int mouth;
 scanf("%d", &mouth);
 switch (month) {
     
case 1: printf("31 days\n"); break;     
case 2: printf("28 days (29 in laep years)\n");break;
case 3: printf("31 days\n"); break;     
case 4: printf("30 days\n"); break;     
case 5: printf("31 days\n"); break;     
case 6: printf("30 days\n"); break;
case 7: printf("31 days\n"); break;
case 8: printf("31 days\n"); break;
case 9: printf("30 days\n"); break;
case 10: printf("31 days\n"); break;
case 11: printf("30 days\n"); break;
case 12: printf("31 days\n"); break;

default:
printf("Invalid input\n");
break;
}

return 0;
}