#include<stdio.h>
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");
            case 4: case 6: case 
        }
    }
}