/* In the name of Allah
   The most beneficent,
   The most merciful
*/
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define read freopen("in.txt","r",stdin)
#define write freopen("out.txt","w",stdout)
#define si(zz) scanf("%ld",&zz)
#define sl(zz) scanf("%lld",&zz)
#define ck puts("ok")
#define reset(a,d) memset(a,d,sizeof(a))
#define CASE(i) printf("Case %lld: ", i)
#define pb(a,b) a.push_back(b)
#define min3(a,b,c) min(a,min(b,c))
#define max3(a,b,c) max(a,max(b,c))
#define min4(a,b,c,d) min(min(a,b),min(c,d))
#define max4(a,b,c,d) max(max(a,b),max(c,d))
#define DIST(x1,x2, y1, y2) (((x1-x2)*(x1-x2))+((y1-y2)*(y1-y2)))
#define DIST3D(x1,x2, y1, y2, z1, z2) (((x1-x2)*(x1-x2))+((y1-y2)*(y1-y2)) + ((z1-z2)*(z1-z2)))
#define ALL(x) (x).begin(),(x).end()
#define LLA(x) x.rbegin(), x.rend()
#define SORT(v) sort(ALL(v))
#define inf   1<<30
#define mod   1000000007
#define PI acos(-1.0)
string sss="0123456789ABCDEF";
//-----------------------------------------------------------//

int main()
{
    ll n,i,x,res=0,now=1;
    cin>>n;
    vector<ll>v;
    for(i=1;i<=n;i++)
    {
        cin>>x;
        pb(v,x);
    }
    SORT(v);reverse(ALL(v));
    for(i=0;i<n;i++)
    {
        res+=(now*v[i]);
        now*=2;
    }
    cout<<res<<endl;
}