N = int(input())
def f(x):
    return x * (x + 1) // 2 * x * (x + 1) // 2
A = []
for L in range(1,2*10**6):
    Y = N + f(L-1)
    ok,ng=L,5*10**7
    while ng - ok > 1:
        m = (ok + ng) // 2
        if f(m) <= Y:
            ok = m
        else:
            ng = m
    if f(ok) == Y:
        A.append([L,ok])
A.sort()
print(len(A))
for a,b in A:
    print(a,b)