#include <iostream>
#include <array>
#include <vector>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <algorithm>
#include <math.h>
#include <string>
#include <climits>
#include <assert.h>
#include <iomanip>
#include <bitset>
#include <queue>
#include <deque>
#include <stack>
#include <functional>
#include <fstream>

#define FOR(i,a,n) for(int i=(a);i<(n); ++i)
#define FOE(i,a) for(auto i : a)
#define ALL(c) (c).begin(), (c).end()
#define RALL(c) (c).rbegin(), (c).rend()
#define SUM(x) std::accumulate(ALL(x), 0LL)
#define MIN(v) *std::min_element(v.begin(), v.end())
#define MAX(v) *std::max_element(v.begin(), v.end())
#define EXIST(v,x) (std::find(v.begin(), v.end(), x) != v.end())
#define IS_BIT_ON(bit, i) (bit & (1 << i))
#define BIT_ON(bit, i) (bit |= (1 << i))
#define BIT_OFF(bit, i) (bit &= ~(1 << i))
#define BIT_COUNT(bit) (__builtin_popcount(bit))

typedef long long LL;
template<typename T> std::vector<T> make_v(size_t a){return std::vector<T>(a);}
template<typename T,typename... Ts> auto make_v(size_t a, Ts... ts){ return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));}    // C++14
template<typename T,typename V> typename std::enable_if<std::is_class<T>::value==0>::type fill_v(T &t,const V &v){t=v;}
template<typename T,typename V> typename std::enable_if<std::is_class<T>::value!=0>::type fill_v(T &t,const V &v){for(auto &e:t) fill_v(e,v);}
template<class T> inline T ceil(T a, T b) { return (a + b - 1) / b; }
void print() { std::cout << std::endl; }
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) { std::cout << head; if (sizeof...(tail) != 0) {std::cout << " ";} print(std::forward<Tail>(tail)...); }
template <class T> void print(std::vector<T> &v) {for (auto& a : v) { std::cout << a; if (&a != &v.back()) {std::cout << " ";} }std::cout << std::endl;}
template <class T> void print(std::vector<std::vector<T>> &vv) { for (auto& v : vv) { print(v); }}
void debug() { std::cerr << std::endl; }
template <class Head, class... Tail> void debug(Head&& head, Tail&&... tail) { std::cerr << head; if (sizeof...(tail) != 0) {std::cerr << " ";} print(std::forward<Tail>(tail)...); }
template <class T> void debug(std::vector<T> &v) {for (auto& a : v) { std::cerr << a; if (&a != &v.back()) {std::cerr << " ";} }std::cerr << std::endl;}
template <class T> void debug(std::vector<std::vector<T>> &vv) { for (auto& v : vv) { print(v); }}
inline bool inside(long long y, long long x, long long H, long long W) {return 0 <= y and y < H and 0 <= x and x < W; }
template<class T> inline double euclidean_distance(T y1, T x1, T y2, T x2) { return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); }
template<class T> inline double manhattan_distance(T y1, T x1, T y2, T x2) { return abs(x1 - x2) + abs(y1 - y2); }
template<typename T> T &chmin(T &a, const T &b) { return a = std::min(a, b); }
template<typename T> T &chmax(T &a, const T &b) { return a = std::max(a, b); }

template<class T> inline std::vector<T> unique(std::vector<T> v) {
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());
    return v;
}

long long sum_of_arithmetic_progression(long long s, long long d, long long n) {
    return n * (2 * s + (n - 1) * d) / 2;
}

bool is_power_of_two(long long x) {
    return !(x & (x - 1));
}

long long gcd(long long a, long long b) {
    if (b == 0) { return a; }
    return gcd(b, a % b);
}

long long gcd(std::vector<long long> &v) {
    long long ans = v[0];
    for (int i = 1; i < (int)v.size(); ++i) {
        ans = gcd(ans, v[i]);
    }
    return ans;
}

long long lcm(long long a, long long b) {
    long long g = gcd(a, b);
    return a / g * b;
}

const int INF = 1u << 30u;
const long long LINF = 1ull << 58u;
const double EPS = 1e-9;
const long double PI = acos(-1.0);
const std::vector<int> dy2 = {0, 1}, dx2 = {1, 0};
const std::vector<int> dy4 = {0, 1, 0, -1}, dx4 = {1, 0, -1, 0};
const std::vector<int> dy8 = { 0, -1, 0, 1, 1, -1, -1, 1 }, dx8 = { 1, 0, -1, 0, 1, 1, -1, -1 };

using namespace std;


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    LL K, X, Y;
    cin >> K;
    cin >> X >> Y;

    // X >= Y >= 0にする
    bool flag_x = false, flag_y = false, flag_swap = false;
    if (X < 0) {
        X *= -1;
        flag_x = true;
    }
    if (Y < 0) {
        Y *= -1;
        flag_y = true;
    }
    if (X < Y) {
        std::swap(X, Y);
        flag_swap = true;
    }
    if ((X + Y) % 2 == 1 && K % 2 == 0) {
        print(-1);
        return 0;
    }

    auto ans = make_v<pair<LL, LL>>(0);
    LL n = std::max<LL>((X + Y + K - 1) / K, 2);
    if ((X + Y) % 2 != n * K % 2) {
        ++n;
    }

    if (X + Y == K) {
        ans.emplace_back(make_pair(X, Y));
    }
    else if (n == 3 && X < K) {
        LL mid = (K + X - Y) / 2;
        ans.emplace_back(make_pair(X, X - K));
        ans.emplace_back(make_pair(X + mid, Y - K + mid));
        ans.emplace_back(make_pair(X, Y));
    }
    else {
        LL over = (n * K - X - Y) / 2;
        for (LL i = 1; i <= n; ++i) {
            LL d = i * K;
            if (d <= Y + over) {
                ans.emplace_back(make_pair(0, d));
            }
            else if (d <= Y + over + X) {
                ans.emplace_back(make_pair(d - Y - over, Y + over));
            }
            else {
                ans.emplace_back(make_pair(X, Y + (n - i) * K));
            }
        }
    }

    if (flag_swap) {
        FOR(i, 0, ans.size()) {
            swap(ans[i].first, ans[i].second);
        }
    }
    if (flag_x) {
        FOR(i, 0, ans.size()) {
            ans[i].first *= -1;
        }
    }
    if (flag_y) {
        FOR(i, 0, ans.size()) {
            ans[i].second *= -1;
        }
    }

    print(ans.size());
    FOR(i, 0, ans.size()) {
        print(ans[i].first, ans[i].second);
    }

    return 0;
}


Measured memory_bytes: 5484