N = int(input())

cum = [0]
D = dict()
D[0] = 0
ans = []
for i in range(1, 10**6+1):
    cum.append(cum[-1]+i**3)
    if cum[-1]-N in D:
        ans.append((D[cum[-1]-N]+1, i))
    D[cum[-1]] = i

print(len(ans))
for l, r in ans:
    print(l, r)