#include <stdio.h>

void citireDate(int n, int a[])
{
    int i;
    for(i = 0; i < n; i++)
        scanf("%d", &a[i]);
}

int compute(int n, int a[])
{
    int i;
    for(i = 0; i < n; i++)
        a[i] = a[i] % 23;

    int freq[23];//restul maxim poate fi 22

    for(i = 0; i < 23; i++)
        freq[i] = 0;

    for(i = 0; i < n; i++)
    {
        freq[a[i]]++;
    }


    int count;
    count = 0;
    for(i = 0; i < 23; i++)
        if(freq[i] != 0)
            count++;

    return count;
}

int main(void)
{
    int n;
    do
    {
        scanf("%d", &n);
    }while( !((n >= 1) && (n <= 100)));

    int a[n];

    citireDate(n, a);

    printf("%d", compute(n, a));

    return 0;
}