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

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

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

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

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

		sorted ++;
	}

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

	return 0;
}