n = 99824

a = []
b = []
for i in range(1, n + 1):
	a.append(1)
	b.append(i + 1)
	a.append(i + 1)
	b.append(i + n + 1)

a.append(b[-1])
b.append(b[-1] + 1)
a.append(b[-1])
b.append(b[-1] + 1)

print(len(a) + 1)
for i, j in zip(a, b):
	print(i, j)