#include<iostream>
#include<algorithm>

using namespace std;

#define NMAX 1000

int main(){

	int N;
	int A[NMAX];

	cin>>N;
	for(int i=0;i<N;i++){
		cin>>A[i];
	}

	sort(A,A+N);

	if(N%2==1) cout<<A[N/2]<<endl;
	else cout<<(double)(A[N/2]+A[N/2-1])/2<<endl;
}