#include <stdio.h>

int main() {
    int month;
    scanf("%d", &month);
    switch (month) {
        
        case 1: printf("31 days\n"); break;
        case 2: printf("28 days (29 in leap 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");
        break;
    }
    
    return 0;
}