#include<iostream>
using namespace std;
int main() {
	int ar[1001], i = 0,cnt=0;
    long long sum=0,l=0;
	while (cin >> ar[i]) {
		cnt++;
		i++;
	}
	for (int j = 0; j < cnt; j++)
	{
        l=ar[j] << (cnt - 1);
		sum += l;
	}
	cout << sum;
	return 0;
}```