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#include <bits/stdc++.h>
#define ll long long
#define endl '/n'
using namespace std;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
// Code goes here //
int n;
cin>>n;
set <int> s;
for (int i =0 ; i<n;i++)
{
int x;
cin>>x;
if (x>0)
s.insert(x);
}
for (int i=1 ; i<=n+1 ; i++)
{
if (!s.count(i))
{
cout<<i;
break;
}
}
}
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