#include<bits/stdc++.h>
using namespace std;
int c, f[110];
int main() {
	
    memset(f, -1, sizeof(f));
	int nc, n, num = 0, j, v = 1, i;
	cin >> nc >> n;
	for (i = 1; i <= n; i++) {
		cin >> c;
		for (j = 1; j <= nc; j++) {
			if (c == f[j])break;
			else if (nc == j) {
				f[v] = c;
				v++;
				num++;
				if (v == nc)
                                v = 1;
			}
		}
	}
	cout << num;
	return 0;
}

求大佬救救，万分感谢