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#include<bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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const int N = 110;
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LL a[N];
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int n;
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LL res;
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int main() {
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//录入进来，终止条件是CTRL+D
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while (cin >> a[++n]);
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n--;
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for (int i = 1; i <= n; i++)
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res += a[i] * pow(2, n - 1);
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cout << res << endl;
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return 0;
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}
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