#include<bits/stdc++.h>
//ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//clock_t start=clock();clock_t end=clock();cout<<(double)(end-start)/CLOCKS_PER_SEC<<endl;
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int ui;
typedef pair<int,int> pii;
typedef pair<pii,int> ppii;
typedef pair<int,pii> pipi;
typedef pair<ll,ll> pll;
typedef pair<pll,ll> ppll;
typedef pair<ll,pll> plpl;
typedef pair<pii,pii> P;
typedef tuple<ll,ll,ll> tl;
typedef pair<double,double> pdd;
typedef vector<vector<ll>> mat;
ll mod=1000000007;
ll mod2=998244353;
ll mod3=1000003;
ll mod4=998244853;
ll mod5=1000000009;
ll inf=1LL<<62;
double pi=3.141592653589793238462643383279L;
double eps=1e-14;
#define rep(i,m,n) for(int i=m;i<n;i++)
#define rrep(i,n,m) for(ll i=n;i>=m;i--)
#define srep(itr,st) for(auto itr=st.begin();itr!=st.end();itr++)
#define mrep(itr,mp) for(auto& itr:mp)
#define Max(a,b) a=max(a,b)
#define Min(a,b) a=min(a,b)
int dh[4]={1,-1,0,0};
int dw[4]={0,0,1,-1};
int ddh[8]={-1,-1,-1,0,0,1,1,1};
int ddw[8]={-1,0,1,-1,1,-1,0,1};
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
#define umh unordered_map<ll,ll,custom_hash>
ll gcd(ll a,ll b){
    if(a<b)swap(a,b);
    if(b==0)return a;
    if(a%b==0)return b;
    return gcd(b,a%b);
}
ll lcm(ll a,ll b){
    ll c=gcd(a,b);
    return a*b/c;
}
ll Pow(ll n,ll k){
    ll ret=1;
    ll now=n;
    while(k>0){
        if(k&1)ret*=now;
        now*=now;
        k/=2;
    }
    return ret;
}
ll beki(ll n,ll k,ll md){
  ll ret=1;
  ll now=n;
    now%=md;
  while(k>0){
    if(k%2==1){
      ret*=now;
      ret%=md;
    }
    now*=now;
    now%=md;
    k/=2;
  }
  return ret;
}
ll gyaku(ll n,ll md){
  return beki(n,md-2,md);
}
ll popcount(ll n){
    ll ret=0;
    ll u=n;
    while(u>0){
        ret+=u%2;
        u/=2;
        
    }
    return ret;
}

int main(){
    ios::sync_with_stdio(false);cin.tie(0);
    ll k,x,y;cin>>k>>x>>y;
    ll xx=x+y,yy=x-y;
    if(abs(xx%2)==1&&k%2==0){
        cout<<-1<<endl;
        return 0;
    }
    vector<pll> v;
    ll s=0,ss=0;
    if(xx<0){
        s=1;
        xx=-xx;
    }
    if(yy<0){
        ss=1;
        yy=-yy;
    }
    if(k%2){
        ll nx=0,ny=0;
        if((xx%k)%2){
            if((yy%k)%2){
                v.push_back({k,yy%k});
                v.push_back({k+xx%k,k+yy%k});
            }
            else{
                v.push_back({xx%k,k});
                if(yy%k!=0)v.push_back({xx%k+k,yy%k});
            }
        }
        else{
            if((yy%k)%2){
                v.push_back({k,yy%k});
                if(xx%k!=0)v.push_back({xx%k,yy%k+k});
            }
            else{
                if(xx%k==0){
                    if(yy%k!=0)v.push_back({k,yy%k-k});
                }
                else{
                    if(yy%k==0)v.push_back({xx%k-k,k});
                    else{
                        v.push_back({xx%k-k,k});
                        v.push_back({xx%k,yy%k});
                    }
                }
            }
        }
        if(v.size()>0){nx=v.back().first;
            ny=v.back().second;}
        for(;;){
            if(nx==xx&&ny==yy)break;
            if(nx<=xx)nx+=k;
            else nx-=k;
            if(ny<=yy)ny+=k;
            else ny-=k;
            v.push_back({nx,ny});
        }
        cout<<v.size()<<endl;
        rep(i,0,v.size()){
            ll bx=v[i].first,by=v[i].second;
            if(s)bx=-bx;
            if(ss)by=-by;
            ll cx=(bx+by)/2;
            ll cy=(bx-by)/2;
            cout<<cx<<" "<<cy<<endl;
        }
    }
    else{
        ll nx=0,ny=0;
        if(xx%k==0){
            if(yy%k!=0){
                v.push_back({k,yy%k});
            }
        }
        else{
            if(yy%k==0)v.push_back({xx%k,k});
            else{
                if(xx<k){
                    v.push_back({xx%k-k,k});
                    if(yy<k){
                        v.push_back({xx%k,yy%k});
                    }
                    else{
                        v.push_back({xx%k,k+yy%k});
                    }
                }
                else{
                    v.push_back({xx%k,k});
                    if(yy<k){
                        v.push_back({k+xx%k,yy%k});
                    }
                    else{
                        v.push_back({k+xx%k,k+yy%k});
                    }
                }
            }
        }
        if(v.size()>0){nx=v.back().first;ny=v.back().second;}
        //cout<<nx<<" "<<ny<<endl;return 0;
        for(;;){
          //  cout<<nx<<" "<<ny<<endl;
            if(nx==xx&&ny==yy)break;
            if(nx<xx)nx+=k;
            else if(nx>xx)nx-=k;
            if(ny<yy)ny+=k;
            else if(ny>yy)ny-=k;
            v.push_back({nx,ny});
        }
        cout<<v.size()<<endl;
        rep(i,0,v.size()){
            ll bx=v[i].first,by=v[i].second;
            if(s)bx=-bx;
            if(ss)by=-by;
            ll cx=(bx+by)/2;
            ll cy=(bx-by)/2;
            cout<<cx<<" "<<cy<<endl;
        }
    }
}


Measured memory_bytes: 5868