N = int(input())
ans = 0
for a in range(10):
    for b in range(10):
        if a == b:
            continue
        lb = 1
        ub = 10 ** 10
        while ub - lb > 1:
            mid = (lb + ub) // 2
            if mid * mid - N * a * mid - N * b - 1 < 0:
                lb = mid
            else:
                ub = mid
        if lb > max(a,b):
            ans += lb - max(a,b)
            #print(a,b,lb)

print(ans)