// editor2
#include <stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    
    if(n<=0 || n>12)
    {
        printf("Invalid input");
        return;
    }
    switch(n){
        case 1: printf("31 days");
        break;
         case 2:  printf("28 days(29 in leap year)");
        break;
        case 3: printf("31 days");
        break;
         case 4:printf("30 days");
        break;
        case 5: printf("31 days");
        break;
        case 6:printf("30 days");
        break;
        case 7: printf("31 days");
        break;
        case 8:printf("31 days");
        break;
        case 9: printf("30 days");
        break;
        case 10: printf("31 days");
        break;
        case 11:printf("30 days");
        break;
        case 12: printf("31 days");
        break;
        default:
        printf("Invalid input");
    }
}