#include <stdio.h>

int main () {
  int n = 0;
  int m = 0;
  
  int max = 0;
  
  int x = 1000000000;
  int y = 0;
  
  for (int i = 1; i < 1000000000/i; i++) {
    long long idx[2] = { 0LL, 1000001LL };
    long long used = ((long long)i)*((long long)(i+2));
    while (idx[1] - idx[0] > 1LL) {
      long long nxt = (idx[0]+idx[1])/2LL;
      if ((nxt*(nxt+3LL))/2LL-5LL <= 1000000000LL-used) {
        idx[0] = nxt;
      } else {
        idx[1] = nxt;
      }
    }
    if (i+((int)idx[0]) > max) {
      n = i;
      m = (int)(idx[0]);
      max = n+m;
    }
  }
  
  
  printf("%d\n", (n+m-2)*8);
  for (int i = m; i > 2; i--) {
    x -= 1;
    y += i;
    printf("%d %d\n", x, y);
  }
  for (int i = 1; i <= n; i++) {
    x -= i;
    y += i+1;
    printf("%d %d\n", x, y);
  }
  for (int i = n; i > 0; i--) {
    x -= i+1;
    y += i;
    printf("%d %d\n", x, y);
  }
  for (int i = m; i > 2; i--) {
    x -= i;
    y += 1;
    printf("%d %d\n", x, y);
  }
  
  for (int i = m; i > 2; i--) {
    x -= i;
    y -= 1;
    printf("%d %d\n", x, y);
  }
  for (int i = 1; i <= n; i++) {
    x -= i+1;
    y -= i;
    printf("%d %d\n", x, y);
  }
  for (int i = n; i > 0; i--) {
    x -= i;
    y -= i+1;
    printf("%d %d\n", x, y);
  }
  for (int i = m; i > 2; i--) {
    x -= 1;
    y -= i;
    printf("%d %d\n", x, y);
  }
  
  for (int i = m; i > 2; i--) {
    x += 1;
    y -= i;
    printf("%d %d\n", x, y);
  }
  for (int i = 1; i <= n; i++) {
    x += i;
    y -= i+1;
    printf("%d %d\n", x, y);
  }
  for (int i = n; i > 0; i--) {
    x += i+1;
    y -= i;
    printf("%d %d\n", x, y);
  }
  for (int i = m; i > 2; i--) {
    x += i;
    y -= 1;
    printf("%d %d\n", x, y);
  }
  
  for (int i = m; i > 2; i--) {
    x += i;
    y += 1;
    printf("%d %d\n", x, y);
  }
  for (int i = 1; i <= n; i++) {
    x += i+1;
    y += i;
    printf("%d %d\n", x, y);
  }
  for (int i = n; i > 0; i--) {
    x += i;
    y += i+1;
    printf("%d %d\n", x, y);
  }
  for (int i = m; i > 2; i--) {
    x += 1;
    y += i;
    printf("%d %d\n", x, y);
  }
  
  return 0;
}