#include<iostream>
#include <cstdio>
using namespace std;
int a[35];
int main()
{
	int i=0,sum=0;
	char ch;
	while(scanf("%d%c",&a[i],&ch))
	{
		sum+=a[i++];
		if(ch=='\n')
			break;
	} 
	int sum2=sum;
	for(int j=i-1;j>=1;j--)
		if(j==1)
			sum+=sum2;
		else
			sum+=2*sum2;
	printf("%d",sum);
	return 0;
}