#include <cstdio>
#include <algorithm>
#include <iostream>

using namespace std;

int main(){

	int N;

	int A[1000];

	scanf("%d",&N);

	int i;
	for (i = 0; i < N; i++){
		scanf(" %d",&A[i]);
	}

	sort(A,A+N);

	if (N % 2 == 1){ printf("%d\n",A[N/2]); }
	else{ 
		double x = (double)A[N / 2]; 
		double y = (double)A[(N / 2) - 1];
		printf("%.1lf\n",(x+y)/2.0);
	}

	return 0;
}