#include <bits/stdc++.h>

using namespace std;

void gets(int *a, int n) {
	char buf[64];
	fgets(buf, sizeof(buf), stdin);

	char *b = buf;
	for (int i = 0; i < n; i++) {
		if (1 != sscanf(b, "%d", a + i)) break;
		while (*b != '\0' && !isspace(*b)) b++;
		while (*b != '\0' && isspace(*b))	b++;
	}
}

int main(int argc, char **argv) {
	int N;
	scanf("%d\n", &N);

	int A[1000];
	gets(A, N);

	sort(A, A + N);

	if (N % 2 == 1) {
		printf("%d\n", A[N/2]);
	} else {
		printf("%.1f\n", (double)(A[N/2-1]+A[N/2])/2.0f);
	}

	return 0;
}