#include <bits/stdc++.h>

using i64 = long long;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int l, s;
    std::cin >> l >> s;
    
    if (l % 2 == 1) {
        std::cout << -1 << "\n";
        return 0;
    }
    l /= 2;
    
    int a = l / 2;
    int b = l - a;
    
    if (s > 1LL * a * b || s < l - 1) {
        std::cout << -1 << "\n";
        return 0;
    }
    
    std::vector<std::pair<int, int>> ans;
    
    ans.push_back({0, 0});
    ans.push_back({a, 0});
    if (s == 1LL * a * b) {
        ans.push_back({a, b});
    } else {
        s -= l - 1;
        int y = 1 + s / (a - 1);
        ans.push_back({a, y});
        int x = 1 + s % (a - 1);
        if (x == 1) {
            ans.push_back({x, y});
            ans.push_back({1, b});
        } else {
            ans.push_back({x, y});
            ans.push_back({x, y + 1});
            if (y + 1 != b) {
                ans.push_back({1, y + 1});
                ans.push_back({1, b});
            }
        }
    }
    ans.push_back({0, b});
    
    std::cout << ans.size() << "\n";
    for (auto [x, y] : ans) {
        std::cout << x << " " << y << "\n";
    }
    
    return 0;
}