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

int main()
{
  int k;
  int least_frequent(int *, int);

  while (scanf("%d", &k) != EOF)
  {
    int i, res, t[200];
    for (i = 0; i < k; ++i)
      scanf("%d", &t[i]);
    res = least_frequent(t, k);
    printf("%d\n", res);
  }

  return EXIT_SUCCESS;
}