#include <stdio.h>

void main(void){
	int n = 0 ; 
	int input = scanf("%d\n",&n);
	int numList[n];
	
	for(int i = 0 ; i < n ; i++){
		input = scanf("%d",numList[i]);
	}
	
	for(int i = 0 ; i < n ; i ++ ){
		for(int j = 0 ; j < n ; j ++){
			if(numList[i] < numList[j]){
				int num = numList[i];
				numList[i] = numList[j];
				numList[j] = num;
			}
		}
	}
	double median = 0;
	if(n%2 == 0){
		median = numList[n/2] + numList[n/2-1];
		median = median / 2 ;
	}else{
		median = (double)numList[n/2];
	}
	
	printf("%0.1f",median);
}