numbers = list(map(int, input().split()))
count = 0
if len(numbers) <= 100:
    for i in range(len(numbers) - 1, 0, -1):
        for j in range (0,i):
            if numbers[j] > numbers[j+1]:
                numbers[j],numbers[j+1] = numbers[j+1],numbers[j]
                count += 1
else:
    print('Повторите ввод')
print(count)