#include <stdio.h>
#include <algorithm>
int main(){
    //input
    int N;
    scanf("%d",&N);

    int A[1000];
    for (int i = 0;i < N;i++){
        scanf("%d",&A[i]);
    }

    //sort array A
    std::sort(A,A+N);

    //calculate median
    float median;
    if (N%2 == 0){
        int index = N/2-1;
        median = 0.5*(A[index]+A[index+1]);
    }else{
        int index = (N-1)/2;
        median = A[index];
    }

    //output
    printf("%f\n",median);
    return 0;
}