#pragma GCC optimize ("O3")
#include <iostream>
#include <iomanip>
#include <istream>
#include <ostream>
#include <sstream>
#include <iterator>
#include <vector>
#include <algorithm>
#include <queue>
#include <deque>
#include <list>
#include <stack>
#include <map>
#include <unordered_map>
#include <set>
#include <bitset>
#include <utility>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <string>
#include <ctime>
#include <cctype>
#include <cstdlib>
#include <numeric>
#define IINF 1000000000
#define INF 3223372036854775807
#define MOD 1000000007
#define mod 1000000007
#define INT_MAX_ 2147483647
#define EPS (1e-10)
#define REP(i, a, n) fo-r (ll i = a; i < (ll)(n); i++)
#define REPE(i, a, n) for (ll i = a; i <= (ll)(n); i++)
//#define rep(i,n)for (ll i = 0; i < (ll)(n); i++)
#define rep(i,l,r)for(ll i=(l);i<(r);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define Endl endl
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define eb emplace_back
#define mmax(x,y)(x>y?x:y)
#define mmin(x,y)(x<y?x:y)
#define chmax(x,y) x=mmax(x,y)
#define chmin(x,y) x=mmin(x,y)
#define all(x) (x).begin(),(x).end()
#define siz(x) (ll)(x).size()
#define PI acos(-1.0)
#define me memset
#define bit(n,k) ((n>>k)&1)
//#define leng length()
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;
typedef long double ld;
typedef pair<int,int>Pin;
typedef pair<ll,ll>Pll;
template<class T> using V=vector<T>;
template<typename T> using min_priority_queue = priority_queue<T, vector<T>, greater<T> >;
long long GCD(long long a, long long b) {return b?GCD(b,a%b):a;}
long long LCM(long long a, long long b) {return a/GCD(a,b)*b;}
ll pom(ll a,ll n,int m){ll x=1;for(a%=m;n;n/=2)n&1?x=x*a%m:0,a=a*a%m;return x;}
#define invp(a,p)pom(a,p-2,p)
int dx[4]={-1,0,1,0};
int dy[4]={0,-1,0,1};
int ddx[8]={-1,0,1,0,1,1,-1,-1};
int ddy[8]={0,-1,0,1,1,-1,1,-1};
ll cmp1(pair<Pll,ll> a,pair<Pll,ll> b){
        return a.fi.se>b.fi.se;
}
ll cmp2(pair<Pll,ll> a,pair<Pll,ll> b){
        return a.se<b.se;
}
//----------------------------------------------------------------------
string cnt[100010];
string cal(ll x){
    string s = "00000000000000000000000000000000";
    for(ll i=31;i>=0;i--){
        if(x & (1<<i)){
            s[i]='1';
        }
    }
    return s;
}
//----------------------------------------------------------------------
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    //-------------------------------  
    //ll begin_t=clock();
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    //------------------------------
    ll n,k;cin>>n>>k;
    V<ll>a(n),b(n);
    for(ll i=0;i<n;i++)cin>>a[i]>>b[i];
    ll ans=0;
    string cntk = cal(k);
    ll lastk=0;
    for(ll i=31;i>=0;i--){
        if(cntk[i]=='1'){
            lastk=i;
            break;
        }
    }
    for(ll i=0;i<n;i++){
        cnt[i]=cal(a[i]);
        //cout<<cnt[i]<<endl;
    }

    for(ll i=lastk;i>=1;i--){
        if(cntk[i]=='0')continue;
        string t = cntk;
        t[i]='0';
        for(ll j=i-1;j>=0;j--){
            t[j]='1';
        }
        //cout<<t<<endl;
        ll res=0;
        for(ll j=0;j<n;j++){
            bool abc=1;
            for(ll x=31;x>=0;x--){
                if(cnt[j][x]=='1'&&t[x]=='0'){
                    abc=0;
                    break;
                }
            }
            if(abc==1)res+=b[j];
        }
        chmax(ans,res);
    }
    string t = cntk;
    ll res=0;
    for(ll j=0;j<n;j++){
        bool abc=1;
        for(ll x=31;x>=0;x--){
            if(cnt[j][x]=='1'&&t[x]=='0'){
                abc=0;
                break;
            }
        }
        if(abc==1)res+=b[j];
    }
    chmax(ans,res);
    cout<<ans<<Endl;
    //------------------------------
    //fclose(stdin);
    //fclose(stdout);
    //ll end_t=clock();cout<<"time="<<end_t-begin_t<<"ms"<<endl;
    //------------------------------- 
    return 0;
}
//----------------------------------------------------------------------


















































Measured memory_bytes: 12644