a=[]
primes=[]
for i in range(2,1300):
  j=2
  fail=0
  while j*j<=i:
    if i%j==0:
      fail=1
      break
    j+=1
  if fail==0:
    primes.append(i)
grid=[]
for i in range(1300):
  grid.append([1]*1300)
for prime in primes:
  for i in range(prime,1300,prime):
    for j in range(prime,1300,prime):
      grid[i][j]=0
for i in range(1,1300):
  for j in range(1,1300):
    if grid[i][j]==1:
      a.append((i,j))

def get_frac(tuple1):
  return tuple1[1]/tuple1[0]

a.sort(key=get_frac)
currx=0
curry=0
print(10**6)
ans=[str(currx)+' '+str(curry)]
for i in range(10**6-1):
  currx+=a[i][0]
  curry+=a[i][1]
  ans.append(str(currx)+' '+str(curry))
print('\n'.join(ans))