#include<stdio.h>
int main()
{
    int month;
    int days[12]={31,28,31,30,31,30,31,30,31,30,31,30};
    scanf("%d",&month);
    if(month < 1|| month > 12)
    {
        printf("Invaid input\n");
    
    }
    else {
        if(month == 2)
    {
        printf("28 days(29 in leap years)");
    }
    else{
    printf("%d days",days[month - 1]);
    }
return 0;
}