#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int N, Q;
cin >> N >> Q;
vector<int> count(N, 0);
for(int i = 0; i < Q; i++) {
int z;
cin >> z;
count[z]++;
}
int answer = 0;
for(int k = 1; k < N; k++) {
answer = max(answer, count[k] - 1);
}
cout << answer << endl;
return 0;
}
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