def count_even(nums):   # 4 56 56 455 4 1 455 4 5
    arr = []
    test = 0
    for x in range(0, len(nums)):
        item = nums[x]
        if item not in arr:
            for y in range(0, len(nums)):
                item2 = nums[y]
                if x != y:
                    if item == item2:
                        test += 1
                        arr.append(item)
                        break
    return test

print(count_even([4, 5, 4, 4, 5]))