> #include<stdio.h>
> 
> int l[20001];
> 
> int main()
> {
> 	//freopen("stat.in", "r", stdin);
> 	int n,i,j;
> 	long long int sum = 0;
> 	scanf("%d", &n);
> 	if (n == 1) {
> 		printf("%d\n",0);
> 		return 0;
> 	}
> 	for (i = 0; i < n; i++)
> 	{
> 		scanf("%d", &l[i]);
> 	}
> 	int t = 1, mi = 1;
> 	while ((mi*=2)<n)
> 	{
> 		t++;
> 	}
> 	if (mi == n) mi *= 2;
> 	for ( i = 0; i < n; i++)
> 	{
> 		for ( j = i+1; j < n; j++)
> 		{
> 			if (l[i]>l[j])
> 			{
> 				int temp = l[i];
> 				l[i] = l[j];
> 				l[j] = temp;
> 			}
> 		}
> 	}
> 	for ( i = 0; i < mi/2; i++)
> 	{
> 		sum = sum + (l[i] * t);
> 	}
> 	for ( i = mi/2; i < n; i++)
> 	{
> 		sum = sum + (l[i] * (t-1));
> 	}
> 	printf("%lld\n", sum);
> 	return 0;
> }