def main(K):
    if K == 0:
        print(1, 10, sep="\n")
        return
    elif K == 1:
        print(2, *[1, 1], sep="\n")
        return

    ok = False
    for i in range(1, int(K ** 0.5 + 0.5) + 1):
        if K % i == 0 and (i + K // i) <= 250:
            ok = True
            two, three = i, K // i
            break

    if ok:
        print(two + three)
        A = [3] * two + [7] * three
        print(*A)
        return

    one = 2
    while True:
        x = one * (one - 1) // 2
        ok = False
        if x > K:
            break
        tmp = K - x
        for i in range(1, int(tmp ** 0.5 + 0.5) + 1):
            if tmp % i == 0 and (one + i + tmp // i) <= 250:
                ok = True
                two, three = i, K // i
                break
        if ok:
            break
        one += 1

    if ok:
        print(one + two + three)
        A = [1] * one + [3] * two + [7] * three
        print(*A)
        return

    print(None)
    return


K = int(input())
main(K)