#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
#define pb push_back
signed main(){
int n,q;
cin>>n>>q;
vector <int> a(q);
vector <int> vis(n + 1, 0);
int cnt = 0;
for(int i = 0;i < q;i++){
cin>>a[i];
vis[a[i]]++;
cnt = max(cnt , vis[a[i]]);
}
cout<<cnt - 1<<'\n';
}
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