N = int(input())
A = list(map(int, input().split()))
assert len(A) == N
ans = 0

for i in range(N):
    for j in range(i + 1, N):
        for k in range(j + 1, N):
            x, y, z = sorted([A[i], A[j], A[k]])
            
            if len(set([x, y, z])) != 2:
                continue
            
            if x + y <= z:
                continue
            
            ans += 1

print(ans)