#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 days in leap year)\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")
    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;
    
    defalut:
    printf("invalid input\n");
    break;
    }