#include <bits/stdc++.h>

#define MAX 2000000
#define INF 2000000000
#define MOD 1000000007

typedef long long ll;
typedef unsigned long long llu;

using namespace std;

int dx[]={0,0,-1,+1,-1,-1,+1,+1};
int dy[]={-1,+1,0,0,-1,+1,-1,+1};

void IO()
{
    freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
}

int main()
{
    //IO();
    ll n,arr[100];
    scanf("%lld",&n);
    for(ll i=0;i<n;i++)scanf("%lld",&arr[i]);
    sort(arr,arr+n);
    ll res=0;
    for(ll i=0;i<n;i++)res=(res*2)+arr[i];
    printf("%lld\n",res);
    return 0;
}