#a=input()
#print(type(a))
#res = list(map(int, str(a)))
#print(res)
n=int(input())
w = list(map(int, input().split()))
print(type(w))
c=0
for i in range(n):
    for j in range(n,2*n):
        if w[i] == w[j]:
            d = j - i
            c += d
print(c)