#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
int q;
cin >> n >> q;
vector<int> over(n + 1), cnt(n + 1);
for (int i = 0; i < q; ++i) {
int x;
cin >> x;
if (x < 0) {
x = -x;
over[x] = -1;
} else {
if (over[x] == 1) {
cnt[x]++;
} else {
over[x] = 1;
}
}
}
cout << *max_element(begin(cnt), end(cnt)) << "\n";
}
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