#include <bits/stdc++.h>
#define int long long
#define pll pair<int,int>
#define endl '\n'
using namespace std;
const int MOD2=998244353;
const int MOD1=1e9+7;
const int N=3e5+7;
const int LOG=20;
const long long inf=8e18+7;
signed main()
{
ios_base::sync_with_stdio(0),
cin.tie(0);
int n,m;
cin>> n>>m;
map<int,int>mp;
int k=0;
while(m--){
int x;
cin>> x;
k++;
if(k==1 && x>0) continue;
if(x>0){
mp[x]++;
}
else {
x=abs(x);
mp[x]--;
}
}
int mx=0;
for(int i=0;i<n;i++){
mx=max(mx,mp[i]);
}
cout<< mx;
}
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