#include <bits/stdc++.h>
using namespace std;
int main()
{
int n,q;
cin>>n>>q;
int cnt[n]={0};
int ans=0;
while(q--)
{
int x;
cin>>x;
if(x>0)
{
// aneeqa overtook x
if(cnt[x]>0)
{
ans++;
for(int i=0;i<n;i++)cnt[i]=0;
}
cnt[x]++;
}
else
{
// x<0
if(cnt[-x]>0)cnt[-x]--;
}
}
cout<<ans<<endl;
}
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