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