#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n,u23[23]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},v,i;
    scanf("%d", &n);
    for(i=0;i<n;i++)
        {
            scanf("%d",&v);
            u23[v%23]++;
        }
    v=0;
    for(i=0;i<23;i++) if(u23[i]>0)v++;
    printf("%d",v);
    return 0;
}