#include<stdio.h>
int main(){
    int month;
    scanf("%d",&month);
    if (month < 1 || month > 12){
        printf("Invalid input\n");
        else if(month == 2)
            printf("28 days in normal years and  29 days leap years");
            break;
            else if(month == 4 || month == 6 || month == 9 || month == 11)
        printf("30 days");
        else
        printf("31 days");
    
    return 0;
}