# https://yukicoder.me/problems/no/3002


def solve(array, N):
    answer = []
    left = 0
    right = 0
    ans = array[left]
    while left < len(array):
        while right + 1 < len(array) and ans + array[right + 1] <= N:
            ans += array[right + 1]
            right += 1

        if ans == N:
            answer.append((left + 1, right + 1))
        
        if left < right:
            ans -= array[left]
            left += 1
        else:
            if right + 1 < len(array):
                left += 1
                right += 1
                ans = array[left]
            else:
                break
    return answer

def main():
    N = int(input())


    array =[]
    i = 1
    while i ** 3 <= N:
        array.append(i ** 3)
        i += 1

    ans1 = solve(array, N)
    print(len(ans1))
    for l, r in ans1:
        print(l, r)



if __name__ == "__main__":
    main()