// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
    }
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    // write your code in JavaScript (Node.js 8.9.4)
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
  const sorted = A.sort((a, b) => a - b)

  let current = 0
  for (let i = 0; i < sorted.length; i++) {
    if (sorted[i] - current > 1) {
      return current + 1
    }
    if (sorted[i] > 0) {
      current = sorted[i]
    }
  }

  return current < 0 ? 1 : current + 1
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
  const sorted = A.sort((a, b) => a - b)

  let current = 0
  for (let i = 0; i < sorted.length; i++) {
    if (sorted[i] - current > 1) {
      return current + 1
    }
    if (sorted[i] > 0) {
      current = sorted[i]
    }
  }

  return current < 0 ? 1 : current + 1
}

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
  const sorted = A.sort((a, b) => a - b)

  let current = 0
  for (let i = 0; i < sorted.length; i++) {
    if (sorted[i] - current > 1) {
      return current + 1
    }
    if (sorted[i] > 0) {
      current = sorted[i]
    }
  }

  return current < 0 ? 1 : current + 1
}