#include <stdio.h>
#define MAXN 10
typedef float ElementType;
ElementType Median( ElementType A[], int N );
int main ()
{
ElementType A[MAXN];
int N, i;
scanf("%d", &N);
for ( i=0; i<N; i++ )
scanf("%f", &A[i]);
printf("%.2f\n", Median(A, N));
return 0;
}
ElementType Median( ElementType A[], int N )
{
int left = 0,right = N-1;
while(1)
{
int l = left,r = right,pos;
ElementType tmp = A[l];
while(l<r)
{
while(l<r&&A[r]>tmp)
r--;
A[l] = A[r];
while(l<r&&A[l]<=tmp)
l++;
A[r] = A[l];
}
A[l] = tmp;
pos = l;
if(pos==N/2)
return A[pos];
else if(pos>N/2)
{
right = pos-1;
}
else
left = pos+1;
}
}