#include<bits/stdc++.h>
#define ll long long
#define co cout<<
using namespace std;
// stuff
void solve(){
ll n,q;
cin>>n>>q;
ll a[n+5]={},ans[n+5]={},mx=0,ex[n+5]={};
memset(a,-1,sizeof(a));
while(q--){
ll x;
cin>>x;
if(x<0){
if(a[x]==0) ex[x]++;
a[x]=0;
}
else{
ans[x]+=ex[x];
ex[x]=0;
if(a[x]==1) ans[x]++;
a[x]=1;
}
mx=max(mx,ans[x]);
}
co mx;
}
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int _=1;
// cin>>_;
while(_--) solve();
}
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