#include<bits/stdc++.h>
using namespace std;
int main()
{
long long n;
cin>>n;
long long ara[n];
for(long long i=1;i<=n;i++)
{
cin>>ara[i];
}
long long cnt=0;
for(long long i=1;i<=n;i++)
{
for(long long j=1;j<=n;j++)
{
if(ara[i]==ara[j])
{
cnt++;
}
}
if(cnt>=3)
{
cout<<ara[i];
break;
}
}
}
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