import sys
from itertools import accumulate
from typing import List, Tuple
import random

int1 = lambda x: int(x) - 1
# input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    n = ii()
    *s, = accumulate(i ** 3 for i in range(10 ** 6 + 2))
    j = 0
    ans = []
    for i in range(len(s)):
        j = max(j, i + 1)
        while j < len(s) and s[j] - s[i] < n:
            j += 1
        if j < len(s) and s[j] - s[i] == n:
            ans.append((i + 1, j))

    print(len(ans))
    for i, j in ans:
        print(i, j)


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()