#include<bits/stdc++.h>
using namespace std;
int main()
{
int N ,Q;
cin >> N>>Q;
vector<int>cc(N, - 1);
int curr = 0;
while(Q--)
{
int a;
cin >> a;
if(a > 0)
{
if(cc[a] !=curr)
{
cc[a] =curr;
}
else
{
curr++;
cc[a] =curr;
}
}
else
{
a *= -1;
cc[a] = -1 ;
}
}
cout << curr<<"\n";
}
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