n = int(input())
l = list(map(int, input().split()))
p = 0 
sum = 0
for i in range(len(l)):
    j = len(l) - 1
    while j >= 0:
        if l[i] == l[j]:
            s = abs(j - i)
            sum +=s 
            break   
        j -=1
    
print(sum)