package main

import . "fmt"
import . "sort"

func main() {
	var n int
	Scan(&n)
	ans := solve(n)
	Strings(ans)
	Println(len(ans))
	for _, s := range ans {
		Print(s)
	}
}

func solve(n int) (ans []string) {
	sum := 0
	r := 0
	for i := 1; i*i*i<=n; i++ {
		sum +=i*i*i
		r = i
	}
	
	for l := 1; l*l*l<=n; l++ {
		for sum > n && r > l {
			sum -= r*r*r
			r--
		}
		for sum < n && r*r*r < n {
			r++
			sum += r*r*r
		}
		if sum == n && l <= r {
			ans = append(ans, Sprintf("%d %d\n", l, r))
		}
		sum -= l*l*l
		if r == l {
			r++
			sum = r*r*r
		}
	}
	
	return
}