#include<stdio.h>

int main()
{
	int N;
	int A[1000];
	int i,j,tmp;
	
	scanf("%d",&N);
	for(i=0;i<N;i++)
		scanf("%d",&A[i]);
	for(i=0;i<N;i++){
		for(j=i+1;j<N;j++){
			if(A[i]>A[j]){
				tmp=A[i];
				A[i]=A[j];
				A[j]=tmp;
			}
		}
	}
	
	if(N%2==0)
		printf("%lf",(double)(A[N/2-1]+A[N/2])/2);
	else
		printf("%d",A[N/2]);
	
	return 0;
}