n = 178884
r = 10**3
a,b = 0, -10**9
c = n//4
print(n)
for i in range(c):
  a += r
  b += i
  print(a,b)

for i in range(c):
  a -= r
  b += c-i
  print(a,b)

for i in range(c):
  a -= r
  b -= i
  print(a,b)

for i in range(c):
  a += r
  b -= (c-i)
  print(a,b)