#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
static int swap(const void* a, const void* b);
int main(void)
{
    int num;
    int data[2000]={0};
    scanf("%d",&num);
    
    for(int i=0;i<num;i++)
    {
        scanf("%d",&data[i]);
    }
    qsort(data, num, sizeof(int), swap);
    if(num%2==0)
    {
        double temp = num/2;
        int data1=temp-1;
        int data2=temp;
        double ans = ((double)data[data1]+(double)data[data2])/2;
        printf("%f",ans);
    }
    else
    {
        int data1=((double)num/2)-0.5;
        printf("%d",data[data1]);
    }
    
}


int swap(const void* a, const void* b)
{
	return *(int*)a - *(int*)b;
}