#include <bits/stdc++.h>
using namespace std;
signed main()
{
int k,n;
cin>>k>>n;
vector <int> a(n+1);
for(int i=1;i<=n;i++){
cin>>a[i];
}
map <int,int> mp;
int cnt=0,d=0;
for(int i=1;i<=n;i++){
if(a[i]<0) cnt++;
else mp[k-a[i]]++;
if(mp[k-a[i]]>1) cnt--;
}
cout<<k;
}
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