This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define f first
#define s second
#define fast_izho ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define vec vector
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define sz(x) (int)(x).size()
#define pw(x) (1LL<<(x))
#define m_p make_pair
//#pragma GCC optimize ("unroll-loops")
using namespace std;
typedef long long ll;
typedef pair<long long,int> pli;
typedef pair<int,int> pii;
template <class T> bool umin(T &a,const T &b){return (a>b?a=b,1:0);}
template <class T> bool umax(T &a,const T &b){return (a<b?a=b,1:0);}
const int N=1e6+1;
vec<int> g[N];
int mt[N],used[N],tt=1;
bool try_kuhn(int v){
if(used[v]==tt) return 0;
used[v]=tt;
for(auto &z : g[v]){
if(mt[z]==-1){
mt[z]=v;return 1;
}
}
for(auto &z : g[v]){
if(try_kuhn(mt[z])){
mt[z]=v;return 1;
}
}
return 0;
}
signed main(){
fast_izho;
int n,m;
cin>>n>>m;
// fill(mt,mt+n,-1);
// for(int i=0;i<n;i++){
// for(int j=m;j<n+m;j++){
// if((i&j)==i)
// g[i].pb(j-m);
// }
// }
// for(int i=0;i<n;i++)
// try_kuhn(i),tt++;
// for(int i=0;i<n;i++)
// cout<<mt[i]<<' '<<m+i<<'\n';
int x=31-__builtin_clz(n);
if(pw(x)<n) ++x;
x=pw(x);
vec<int>b(x,-1);
int j=0;int kk=0;
for(int i=m;i<m+n;i++){
if(i%x==0) kk=1;
j+=(!kk);
b[i%x]=i;
}
for(int i=0;i<n-j;i++)
cout<<i<<' '<<b[i]<<endl;
// cout<<endl;
for(int i=n-1;i>=n-j;i--){
int kt=0;
for(int k=m;k<m+j;k++){
if((i&k)==i && b[k%x]!=-1){
b[k%x]=-1;
cout<<i<<' '<<k<<endl;
kt=1;
break;
}
}
assert(kt);
}
// for(int i=0;i<x;i++)
// cout<<i<<' '<<b[i]<<'\n';
return 0;
}
/*
*/
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