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

int cmp(const void *a,const void *b)
{
    if(*(unsigned int *)a>*(unsigned int *)b)
		return 1;
    else if(*(unsigned int *)a==*(unsigned int *)b)
		return 0;
	if(*(unsigned int *)a<*(unsigned int *)b)
		return -1;
}
int main()
{
     unsigned int n;
	 unsigned int sort[250005];
	 unsigned int i;
	 scanf("%u",&n);
	 for(i=0;i<n;i++)
		 scanf("%u",&sort[i]);
	 qsort(sort,n,sizeof(sort[0]),cmp);
	 if(n%2)
		 printf("%u\n",sort[(n+1)/2-1]);
	 else{
	     if((sort[n/2-1]+sort[n/2])%2)
			 printf("%u.5\n",(sort[n/2-1]+sort[n/2])/2);
		 else
			 printf("%u\n",(sort[n/2-1]+sort[n/2])/2);
	 }
	 return 0;
}