# your code goes here
def InversionCount(a,n):
count = 0
for i in range(len(a)):
for j in range(i+1,len(a)):
if a[i]>a[j]:
count+=1
return count
a = list(map(int,input().split()))
print(InversionCount(a,len(a)))
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmRlZiBJbnZlcnNpb25Db3VudChhLG4pOgoJY291bnQgPSAwCglmb3IgaSBpbiByYW5nZShsZW4oYSkpOgoJCWZvciBqIGluIHJhbmdlKGkrMSxsZW4oYSkpOgoJCQlpZiBhW2ldPmFbal06CgkJCQljb3VudCs9MQoJcmV0dXJuIGNvdW50CmEgPSBsaXN0KG1hcChpbnQsaW5wdXQoKS5zcGxpdCgpKSkKcHJpbnQoSW52ZXJzaW9uQ291bnQoYSxsZW4oYSkpKQoKCQkJ