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