n=int(input())
ri = list(map(int, input().split()))
rr=ri[::-1]
d1=0



for i0 in range(0,n):
    b = ri[i0]
    i1 = ri[::-1].index(b)
    d0 = 2*n - i1 - i0 -1 
    d1 += d0

print(d1)