def f(N, a, b, p):
    return N * (a * p + b) > p * p - 1

N = int(input())
ans = 0
for a in range(10):
    for b in range(10):
        if a == b:
            continue
        yes = 0
        no = 10 ** 9 + 1
        while no - yes != 1:
            mid = (yes + no)//2
            if f(N, a, b, mid):
                yes = mid
            else:
                no = mid
        ans += max(0, yes - max(a, b))
        # print(a, b, mid)
print(ans)