#include <stdio.h>

void sort(float *src, int size) {
    int i = 0;
    int j = 0;
    int tmp = 0;
    float *dst;
    dst = src;
    for (i = 0; i < size - 1; i++) {
        for(j = i; j < size - 1; j++) {
        if (*(dst + i) > *(src + j+1)){
            tmp = *(dst + j + 1);
            *(dst + j + 1) = *(dst + i);
            *(dst + i) = tmp;
        }
        }
    }
    src = dst;
}

float getMedian(float *src, int size) {
    if (size % 2 == 0) {
        return (*(src + (size - 1)/2) + *(src + (size)/2)) / 2;
    } 
    return *(src + size/2);
}

int main(void) {
    unsigned int N = 0;
    scanf("%d", &N);

    float in[1000] = {};
    unsigned int itr = 0;
    for (itr = 0;itr < N; itr++) {
        scanf("%f", &in[itr]);
    }

    sort(in, N);
    printf("%.1f\n", getMedian(in, N));
    return 0;
}