from random import randint
a=[randint(100,500) for i in range(1,100)]
n=len(a)
count=0
for i in range(n-1):
    for j in range(n-i-1):
        if a[j+1]<a[j]:
            a[j], a[j+1]=a[j+1], a[j]
            count+=1
print(count)