#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
const int N = 510;
bool use[N];
int main(){
fastIO;
int n, m;
cin >> n >> m;
for(int i = n - 1; i >= 0 ; i -- ){
for(int j = 0 ; j < n; j ++ ){
if(use[j]) continue;
if((i & (m + j))==i){
use[j]=true;
cout << i << " " << m + j << "\n";
break;
}
}
}
return 0;
}
