h = int(1.4142 * 10 ** 4.5)
ans = []
s = x = 0
for i in range(h, -1, -1):
    s += i
    x += 1
    ans.append([x,s])
for i in range(1, h+1):
    s -= i
    x += 1
    ans.append([x,s])
s = 0
for i in range(h, -1, -1):
    s += i
    x -= 1
    ans.append([x,-s])
for i in range(1, h+1):
    s -= i
    x -= 1
    ans.append([x,-s])
print(len(ans))
for row in ans:
    print(*row)