/* Smallest difference */

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

static int compare (const void *a, const void *b)
{
  return *((int *) a) - *((int *) b);
}

int main (void)
{
  int n, *arr, i, min_diff = INT_MAX, min_ind[1024], curr_diff, count = 0;
  
  scanf (" %d", &n);
  arr = malloc (sizeof (int) * n);
  
  for (i=0; i<n; i++)
  {
	scanf (" %d", &arr[i]);
  }
  
  qsort (arr, n, sizeof (int), compare);
  
  for (i=0; i<n-1; i++)
  {
	curr_diff = abs (arr[i+1] - arr[i]);
	if (curr_diff < min_diff)
	{
	  min_diff = curr_diff;
	  count = 0;
	  min_ind[count++] = i;
	}
	else if (curr_diff == min_diff)
	{
	  min_ind[count++] = i;
	}
  }
  
  for (i=0; i<count; i++)
  {
	printf ("%d",arr[min_ind[i]+1]); 
  }
  
  free (arr);
  return 0;
}