#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

int main ( void )
{
	uint16_t n, i, n_half;
	int16_t a[1000], sort_temp;
	int16_t sort_min, sort_max;
	uint16_t sort_min_index, sort_max_index;
	uint16_t sorted = 0u;

	scanf("%d", &n);
	for ( i = 0u; i < n; i++ ) {
		scanf("%d", &a[i]);
	}

	n_half = n / 2;

	while ( sorted < n_half ) {
		sort_min = 1000;
		sort_max = -1000;
		for ( i = sorted; i < n; i++ ) {
			if ( sort_min > a[i] ) {
				sort_min = a[i];
				sort_min_index = i;
			}
			if ( sort_max < a[i] ) {
				sort_max = a[i];
				sort_max_index = i;
			}
		}

		sort_temp = a[sort_min_index];
		a[sort_min_index] = a[sorted];
		a[sorted] = sort_temp;

		sort_temp = a[sort_max_index];
		a[sort_max_index] = a[n - 1 - sorted];
		a[n - 1 - sorted] = sort_temp;

		sorted ++;
	}

	for ( i = 0; i < n; i++ ) {
		if ( i > 0 ) {
			fprintf(stderr, ", ");
		}
		fprintf(stderr, "%d", a[i]);
	}
	fprintf(stderr, "\n");

	if ( n % 2 ) {
		printf("%d\n", a[n_half]);
	} else {
		printf("%.1f\n", ((float)a[n_half] + (float)a[n_half - 1]) / 2);
	}

	return 0;
}