def sum2(nums):
    """
    Given an array of ints, return the sum of the first 2 elements in the array. If the array length is less than 2, just sum up the elements that exist, returning 0 if the array is length 0.


    sum2([1, 2, 3]) → 3
    sum2([1, 1]) → 2
    sum2([1, 1, 1, 1]) → 2
    """

    end = 2
    if len(nums) < 2:
        end = len(nums)


    sum = 0
    for i in range(0, end):
        sum += nums[i]

    return sum