import sys
input = sys.stdin.readline

N=int(input())
P=list(map(int,input().split()))

for i in range(N):
    P[i]-=1

IND=[-1]*N

for i in range(N):
    IND[P[i]]=i

ANS=0
for i in range(N):
    x=IND.index(i)

    while  x>i:
        IND[x],IND[x-1]=IND[x-1],IND[x]
        x-=1
        ANS+=1

    #print(P)
    #print(x,ANS)

print(ANS)