#include<bits/stdc++.h>
using namespace std;
int main()
{
long long n, q;
cin >> n >> q;
vector<long long> bezci(n, false); // false ak su pred, true ak su za
long long lap = 0;
for (long long i = 0; i < q; i++)
{
long long a;
cin >> a;
if (a < 0) bezci[-a] = false;
else if (bezci[a]) lap++;
else bezci[a] = true;
}
cout << lap << '\n';
return 0;
}
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