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225.cxx
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225.cxx
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/*
* 225.cxx
*
* Copyright 2019 hp <hp@hp-HP-ProBook-4530s>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*
*/
#include <bits/stdc++.h>
using namespace std;
int main()
{ int n,x,l,s;
cin >> n >>x;
for(int i=0;i<n;i++){
cin >> l >>s;
if(l==x || s==x || l==7-x || s==7-x){
cout << "NO";
return 0;
}
}
cout << "YES";
return 0;
}