a = 10**6
N = int(input())
l = []
for i in range(a+1):
    l.append(i**2*(i+1)**2)
import bisect
ans = []
for j,i in enumerate(l):
    r4 = i+4*N
    #print(i,r4,l[:10])
    id = bisect.bisect_left(l,r4)
    if id == a+1:
        break
    elif l[id] == r4:
        ans.append((j+1,id))
print(len(ans))
for i,j in ans:
    print(i,j)