#include <algorithm>
#include <cinttypes>
#include <cstdint>
#include <cstdio>
#include <functional>
using namespace std;

#define MAXN 40

int c[MAXN];

int main() {
    int n; scanf("%d", &n);
    for (int i=0; i<n; ++i) { scanf("%d", &c[i]); }
    sort(c, c+n, greater<int>());
    int64_t base = 1LL, ans = 0LL;
    for (int i=0; i<n; ++i) {
        ans += base * c[i];
        base <<= 1;
    }   

    printf("%" PRId64 "\n", ans);
    return 0;
}