#include <bits/stdc++.h>
#define endl '\n'
#define F first
#define S second
using namespace std;
#define ll long long
#define pb push_back
#define mod 1000000007
#define int long long
#define all(x)      x.begin(),x.end()
#define allr(x)     x.rbegin(),x.rend()
#define CheckBit(x,k)   (x & (1LL << k))
#define SetBit(x,k)     (x |= (1LL << k))
#define ClearBit(x,k)   (x &= ~(1LL << k))
#define LSB(mask)       __builtin_ctzll(mask)
#define MSB(mask)       63-__builtin_clzll(mask) 
#define print(x)    cout << #x << " : " << x << endl
#define error1(x)   cerr << #x << " = " << (x) <<endl
#define coutall(v)  for(auto &it: v) cout<<it<<' '; cout<<endl
#define Abid_52     ios::sync_with_stdio(false);cin.tie(0),cin.tie(0)
#define error2(a,b) cerr<<"( "<<#a<<" , "<<#b<<" ) = ( "<<(a)<<" , "<<(b)<<" )\n"
#define UNIQUE(x)   sort(all(x)), x.erase(unique(all(x)), x.end()), x.shrink_to_fit()
template <typename T, typename U> T ceil(T x, U y) {return (x > 0 ? (x + y - 1) / y : x / y);}
template <typename T, typename U> T floor(T x, U y) {return (x > 0 ? x / y : (x - y + 1) / y);}

const int N = 1e5 + 10;

void solve()
{
    int n, m;
    cin >> n >> m;
    vector<int> v(n + 5);
    for (int i = 0; i < n; i++)
    {
        cin >> v[i];
    }
    // ll mx=0;
    // for(int i=0;i<=m;i++)
    // {
    //     ll ans=0;
    //     for(int j=0;j<n;j++)
    //     {
    //         ans+=(v[j]^i);
    //     }
    //     mx=max(ans,mx);
    //     // if(ans==34)print(i);
    // }
    // print(mx);
    vector<int>zero(45,0);
    for (int j = 0; j < n; j++)
    {
        for (int i = 44; i >= 0; i--)
        {
            if(!CheckBit(v[j],i))
            {
                zero[i]++;
            }
        }
    }
    ll ans=0;
    vector<pair<int,int>>temp;
    for(int i=44;i>=0;i--)
    {
        if((1ll<<i <= m) && (zero[i]>n/2))
        {
            temp.push_back({(1ll<<i)*zero[i],i});
        }
        else
        {
            ans+=((n-zero[i])*(1ll<<i));
        }
    }
    // for(auto it : temp)
    // {
    //     cout<<it.F<<' '<<it.S<<endl;
    // }
    auto rec=[&](int i,int rem,auto&& self)
    {
        if(i==temp.size())return 0ll;
        int val=(((1ll<<temp[i].S)*n)-temp[i].F)+self(i+1,rem,self);//nibo na

        if((1<<temp[i].S)<=rem)
        {
            val=max(val,temp[i].F+self(i+1,rem-(1<<temp[i].S),self));//nibo
        }
        else
        {
            // print((1ll<<temp[i].S)*n);
            // print((1ll<<n)-temp[i].F);
            val=max(val,((1ll<<temp[i].S)*n)-temp[i].F+self(i+1,rem,self));
        }
        return val;
    };
    int fans=rec(0,m,rec);
    cout<<ans+fans<<endl;
}

int32_t main()
{
    Abid_52;
    int t = 1;
    // cin >> t;
    for (int tc = 1; tc <= t; ++tc)
    {
        // cout << "Case " << tc << ": ";
        solve();
    }
}