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