ANS=["0 0"]
x=10**9
y=0

N=1000000
while len(ANS)<N:
    ANS.append(str(x)+" "+str(y))

    if len(ANS)%2==0:
        y+=1
    else:
        x-=1
        y+=1

print(N,flush=True)
print("\n".join(ANS),flush=True)