#include <stdio.h>
#define DEBUG

int main(void){
	int n;
	scanf("%d", &n);
	int a[n];
	for(int i = 0; i < n; i++){
		scanf("%d", a+i);
	}
	int i = 1;
	int temp;
	while(i){
		i = 0;
		for(int j = 0; j < n-1; j++){
			if(a[i] < a[i+1]){
				temp = a[i+1];
				a[i+1] = a[i];
				a[i] = temp;
				i++;
			}
		}
	}
#ifdef DEBUG
	for(int i = 0; i < n; i++){
		printf("%d ", a[i]);
	}
	printf("\n");
#endif
	
	if(n % 2 != 0){
		printf("%d\n", a[n/2]);
	}
	else{
		float b, c;
		b = a[(n-2)/2];
		c = a[n/2];
		printf("%f\n", (b+c)/2);
	}
	return 0;
}