#include<bits/stdc++.h>
//ios::sync_with_stdio(false);cin.tie(0);
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
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 tuple<ll,ll,ll> tl;
ll mod=1000000007;
ll mod2=998244353;
ll mod3=1000003;
ll mod4=998244853;
ll inf=1000000000000000000;
double pi=2*acos(0);
#define rep(i,m,n) for(ll i=m;i<n;i++)
#define rrep(i,n,m) for(ll i=n;i>=m;i--)
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};
ll lmax(ll a,ll b){
    if(a<b)return b;
    else return a;
}
ll lmin(ll a,ll b){
    if(a<b)return a;
    else return b;
}
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 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 gya[1000010];
ll kai[1000010];
ll beki(ll n,ll k){
    ll ret=1;
    ll now=n;
    while(k>0){
        if(k%2==1){
            ret*=now;
            ret%=mod2;
        }
        now*=now;
        now%=mod2;
        k/=2;
    }
    return ret;
}
ll gyaku(ll n){
    return beki(n,mod-2);
}
void nckinit(ll n){
    kai[0]=1;
    kai[1]=1;
    for(int i=2;i<=n;i++){
        kai[i]=kai[i-1]*i;
        kai[i]%=mod;
    }
    gya[n]=gyaku(kai[n]);
    for(int i=n-1;i>=1;i--){
        gya[i]=gya[i+1]*(i+1);
        gya[i]%=mod;
    }
    gya[0]=1;
}
ll nck(ll n,ll k){
    if(k<0)return 0;
    if(k==0||n==k)return 1;
    ll ret=kai[n];
    ret*=gya[n-k];
    ret%=mod;
    ret*=gya[k];
    ret%=mod;
    return ret;
}
ll npk(ll n,ll k){
    if(k<0)return 0;
    if(k==0)return 1;
    ll ret=kai[n];
    ret*=gya[n-k];
    ret%=mod;
    return ret;
}
ll dat[800010];
ll u;
void seginit(ll n){
  ll y=1;
  for(int i=0;;i++){
    
    if(y>=n){
      u=y;
      break;
    }
    y*=2;
  }
  fill(dat,dat+2*u,inf);
}
void add(ll n,ll x){
  ll i=n+u-1;
  dat[i]=x;
  while(i>0){
    i=(i-1)/2;
    dat[i]=min(dat[2*i+1],dat[i*2+2]);
  }
}
ll que(ll a,ll b,ll k,ll l,ll r){
  if(a>=r||b<=l)return inf;
  if(a<=l&&b>=r)return dat[k];
  ll m1=que(a,b,2*k+1,l,(l+r)/2);
  ll m2=que(a,b,2*k+2,(l+r)/2,r);
  return min(m1,m2);
}
int main(){
    ios::sync_with_stdio(false);cin.tie(0);
    ll n,k;cin>>n>>k;
    ll u=2*n-k;
    ll sum=0;
    rep(i,u,u+n)sum+=i;
    ll y=(2*n*(2*n-1))/2;
    if(y>sum){
        cout<<-1<<endl;
        return 0;
    }
    vector<pll> v;
    rep(i,0,2*n){
        if(i>=2*n-i-1)break;
        v.push_back({i,2*n-i-1});
    }
    ll t=(n+1)/2;
    ll cnt=(n-1)/2;
    ll s=0;
    rep(i,0,cnt){
        if(i%2==0){
            swap(v[s].first,v[s+cnt-i].first);
            s++;
        }
        else{
            swap(v[t].first,v[t+cnt-i].first);
            t++;
        }
    }
    set<ll> st;
    rep(i,2*n,3*n)st.insert(i+k);
    rep(i,0,n){
        ll su=v[i].first+v[i].second+2*k;
        auto itr=st.lower_bound(su);
        ll uu=*itr;
        cout<<v[i].first+k<<" "<<v[i].second+k<<" "<<uu<<endl;
        st.erase(itr);
    }
}


Measured memory_bytes: 9584