def sqrt(k):
    x = k
    next_x = x - (x * x - k) // (x << 1)
    while abs(x - next_x) > 10:
        x = next_x
        next_x = x - (x * x - k) // (x << 1)
    return next_x
N = 10**6
r = 10**9 - 10
print(N)
r2 = r**2 - 1
x = r
for _ in range(N):
    print(x, sqrt(r2 - x**2))
    x -= 1