#include <stdio.h>
int main(){
    int month;
    scanf("%d",&month);
    if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
        printf("31 days");
    else if (month == 4 || month == 6 || month == 9 || month == 11){
        printf("30 days");
    else if (month == 2)
        printf("28 or 29 days");
        else
        printf("Invalid input");
    
    return 0;
    
    }