#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 years)");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;
        deafult:printf("Invalid input");
    }
    
    
}