#include <bits/stdc++.h>
typedef long long     ll;
#define endl          '\n'
#define F             first
#define S             second
#define pb            push_back
#define yes           cout<<"YES\n"
#define no            cout<<"NO\n"
#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 MSB(mask)     63-__builtin_clzll(mask) 
#define LSB(mask)     __builtin_ctzll(mask)  
#define error1(x)     cerr << #x << " = " << (x) <<endl
#define error2(a,b)   cerr<<"("<<#a<<", "<<#b<<") = ("<<(a)<<", "<<(b)<<")\n";
#define coutall(v)    for(auto &it: v) cout<<it<<" "; cout<<endl;
#define _ASRafi__     ios::sync_with_stdio(false); cin.tie(0);
using namespace std;

void solve()
{
    ll n, k, ans = 0;
    cin >> n >> k;
    vector<bitset<41>> v(n);
    for (int i = 0; i < n; i++) {
        ll x; cin >> x;
        v[i] = x;
    }
    vector<pair<ll, ll>> profit(41);
    for(int i = 0; i < 41; i++) {
        ll c1 = 0;
        for(int j = 0; j < n; j++) c1 += v[j][i];
        // if x[i] = 1
        ll lab = (n - c1) * (1LL << i), loss = c1 * (1LL << i);
        profit[i] = {lab, loss};
        // cout << i << " -> " << lab << ", " << loss << endl;
    }
    bitset<41> b1 = k;
    bool ok = 0;
    for(int i = MSB(k); i >= 0; i--) { // sob nibo
        if(ok) ans += max(profit[i].F, profit[i].S);
        else if(profit[i].F <= profit[i].S){
            ans += max(profit[i].F, profit[i].S);
            if(b1[i] == 1) ok = 1;
        }
        else if(b1[i] == 1) ans += profit[i].F;
        else ans += profit[i].S;
        // cout << i << " => " << ans << endl;
    }   
    ll back = 0;
    for(int i = MSB(k); i >= 0; i--) { // nibo na
        if(b1[i] == 1) {
            ll tmp = back;
            for(int j = i - 1; j >= 0; j--) {
                tmp += max(profit[j].F, profit[j].S);
            }
            ans = max(ans, tmp);
        }

        if(b1[i] == 1) back += max(profit[i].F, profit[i].S);
        else back += profit[i].S;
    }
    cout << ans << endl;
    return;
}

int32_t main()
{
    _ASRafi__;
    int tc = 1;
    // cin >> tc;
    for (int t = 1; t <= tc; t++)
    {
        // cout << "Case " << t << ": ";
        solve();
    }
    return 0;
}