N = int(input())

ans = []
for x in range(N+1):
    for y in range(N+1):
        if(x == y == 0):continue
        if(x*y > N):break
        if((N - x*y) % (x+y) != 0):continue
        z = (N - x*y) // (x+y)
        ans.append((x,y,z))

print(len(ans))
for i in ans:
    print(*i)