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