#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#define PII pair<int, int> 
const int N = 1e5+10;
int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, 1, 0, -1};
int gcd(int x,int y){
    return y ? gcd(y, x % y) : x;
}
const int mod = 1e9 + 7;
void solve()
{
    int n, m;
    cin >> n >> m;
    priority_queue<int,vector<int>,greater<int>>q;
    for (int i = 0; i < n; i++){
        int x;
        cin >> x;
        q.push(x);
    }
    while(m --){
        auto u = q.top();
        q.pop();
        q.push(u * 2);
    }
    int ans = 0; 
    while(q.size()){
        auto u = q.top();
        q.pop();
        ans += u;
    }
    cout << ans <<  endl;
}
signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int _;
    _ = 1;
    //cin >> _;
    while (_--)
    {
        solve();
    }

    return 0;
}