#include <bits/stdc++.h>
const int N = 105;
const double pi = acos(-1.0);
int X1[N], Y1[N], X2[N], Y2[N];
int main() {
  int n, m, i;
  scanf("%d%d", &n, &m);
  if (m == 3 && n > 4) {
    puts("-1");
    return 0;
  }
  if (m == 4 && n > 6) {
    if (n == 7) {
      puts("-10000000 10000000");
      puts("-10000000 -10000000");
      puts("10000000 10000000");
      puts("10000000 -10000000");
      puts("-500000 1000000");
      puts("500000 1000000");
      puts("500000 -1000000");
    } else if (n == 8) {
      puts("-10000000 10000000");
      puts("-10000000 -10000000");
      puts("10000000 10000000");
      puts("10000000 -10000000");
      puts("-500000 1000000");
      puts("500000 1000000");
      puts("-500000 -1000000");
      puts("500000 -1000000");
    }
    return 0;
  }
  int d = m / 2 * 2 + 1;
  for (i = 0; i < d; i++) {
    X1[i] = 10000000 * cos((double)i / d * 2 * pi) + 1;
    Y1[i] = 10000000 * sin((double)i / d * 2 * pi) + 1;
    X2[i] = 5000000 * cos((double)i / d * 2 * pi) - 1;
    Y2[i] = 5000000 * sin((double)i / d * 2 * pi) - 1;
  }
  for (i = 0; i < m; i++) printf("%d %d\n", X1[i], Y1[i]);
  for (i = 0; i < n - m; i++) printf("%d %d\n", X2[i], Y2[i]);
  return 0;
}
