from collections import defaultdict
m=10**6
n=int(input())
r=[0]*(m+1)
for i in range(m):
	r[i+1]+=(i+1)**3
	r[i+1]+=r[i]

s=defaultdict(int)
for i in range(m+1):
	s[r[i]]=i

ans=[]
for i in range(m+1):
	if r[i]+n in s:
		ans.append((i+1,s[r[i]+n]))
print(len(ans))
for l,r in ans:
	print(l,r)