文件目录

#include <iostream>
using namespace std;
int m, n, w;
int nc[10000] = {}, s = 0, e = 0;
bool findnc(int x)
{
    for (int i = s; i < e; i++)
        if (nc[i] == x)
            return true;
    return false;
}
void addnc(int x)
{
    if (e - s == m)
    {
        nc[e++] = x;
        s++;
    }
    else
        nc[e++] = x;
}
int main()
{
    cin >> m >> n;
    int ans = 0;
    while (n--)
    {
        cin >> w;
        if (findnc(w))
            continue;
        else
        {
            ans++;
            addnc(w);
        }
    }
    cout << ans;
    return 0;
}