#include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     if (m == 3) {       if (n == 3) {         cout << 0 <<     << 0 <<   n ;         cout << 0 <<     << 1 <<   n ;         cout << 1 <<     << 0 <<   n ;         return 0;       } else if (n == 4) {         cout << 0 <<     << 0 <<   n ;         cout << 0 <<     << 10 <<   n ;         cout << 10 <<     << 0 <<   n ;         cout << 1 <<     << 1 <<   n ;         return 0;       } else if (n >= 5) {         cout << -1;         return 0;       }     }     int x = 1000000;     for (int i = 0; i < m; i++) cout << i <<     << (i * i + x) <<   n ;     for (int i = 0; i < n - m; i++) cout << i <<     << (-i * i - x) <<   n ;     return 0;   }   