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#include <stdio.h>

int main()
{
  int n;

  int b = 0;

  int len = 301725;

  char mon[len];

  for (int i = 0; i < len; i++)
  {
    mon[i] = 0;
  }

  scanf("%d", &n);

  for (int i = 0; i < n; i++)
  {
    int a;

    scanf("%d", &a);

    while (mon[a] == 1)
    {
      mon[a++] = 0;
    }

    mon[a] = 1;

    if (a > b)
    {
      b = a;
    }
  }

  printf("%d", b);

  return 0;
}