def d(x):
    while x > 9:
        x = sum(int(c) for c in str(x))
    return x

def count_failing_cases(n):
    total = 0
    for a in range(1, n+1):
        for b in range(1, n+1):
            for c in range(1, n+1):
                if d(a*b) == c and a*b != c:
                    total += 1
    return total

for n in [4, 5]:
    print(f"count_failing_cases({n}) = {count_failing_cases(n)}")