#include<fstream>
using namespace std;
#define DMAX 1000001
int v1[DMAX],v2[DMAX];
int main()
{
	ifstream cin("elmaj.in");ofstream cout("elmaj.out");
	int i,n,k1,k2,s=0;
	cin>>n;k2=n;
	for(i=1;i<=n;i++)
		cin>>v2[i];
	while(k2!=1)
	{
		k1=0;
		for(i=1;i<k2;i+=2)
			if(v2[i]==v2[i+1])
				v2[++k1]=v2[i];
		k2=k1;
	}
	/*
	for(i=1;i<=n;i++)
		if(v1[i]==v2[k2])
			s++;*/
	cout<<v2[k2];
}