n = int(input())
P = [int(x)-1 for x in input().split()]
ind = [0]*n
for i,p in enumerate(P):
    ind[p] = i

ans = 0
for i in range(n):
    if ind[i] <= i:
        continue
    for j in range(P[i],i,-1):
        ans += 1
        P[ind[j]],P[ind[j-1]] = P[ind[j-1]],P[ind[j]]
        ind[j],ind[j-1] = ind[j-1],ind[j]

print(ans)