题目链接：https://codeforces.com/contest/22/problem/A
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
vector<int> v;
int n;
int main()
{scanf("%d",&n);for(int i=0;i<n;i++){int x;scanf("%d",&x);v.push_back(x);}sort(v.begin(),v.end());v.erase(unique(v.begin(),v.end()),v.end());if(v.size()<2) puts("NO");else printf("%d\n",v[1]);return 0;
}
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