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#include <stdio.h>

static int powersOfTwo[1000000];

int main() {
  int n;
  int max = 0;

  scanf("%d",&n);
  for (int i = 0; i < n; i++) {
    int a;
    scanf("%d",&a);

    powersOfTwo[a]++;

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

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

  printf("%d\n", max);

  return 0;
}