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