#include <stdio.h>
int main()
{
    int m;
    scanf("%d",&m);
    if(year<1 || year>12)
    {
        printf("Invalid input");
    }
    else if(m== 2)
    {
        printf("28 days (29 in leap year)");
    }
    else if(m==1 ||m==3 ||m==5 ||m==7 ||m==8 ||m==10 ||m==12)
    {
        printf("31 days");
    }
    else
    {
        printf("30 days");
    }
    return 0;
}