#include <stdio.h>
int main()
{
    int year;
    scanf("%d",&year);
    if(year<1 || year>12)
    {
        printf("Invalid input");
    }
    else if(year==1,3,5,7,8,10,12)
    {
        printf("31 days");
    }
    else if(year=='4','6','9',)
    {
        printf("30 days");
    }
    else
    {
        printf("28 days (29 in leap year)");
    }
    return 0;
}