5 3 8 1 9 2
8

YES

nums = sorted(map(int, input().split()))
target = int(input())
left, right = 0, len(nums) - 1
found = False
while left <= right:
    mid = (left + right) // 2
    if nums[mid] == target:
        found = True
        break
    elif nums[mid] < target:
        left = mid + 1
    else:
        right = mid - 1
print('YES' if found else 'NO')