#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(int argc, char* argv[])
{
	int i,N;
	cin>>N;
	vector<int> A(N);
	for (i=0;i<N;i++){
		cin>>A[i];
	}
	if (N==1){
		cout<<A[0]<<endl;
		return 0;
	}
	sort(A.begin(),A.end());
	if (N%2==0){
		cout<<(A[N/2-1]+A[N/2])/2.0<<endl;
	}else{
		cout<<A[N/2]<<endl;
	}
	return 0;
}