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OI-codes/Luogu/P2415/P2415.cpp

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2020-09-23 11:16:49 +00:00
// R38780934
#include <bits/stdc++.h>
using namespace std;
int main() {
long long sum, a, i;
sum = a = i = 0;
while (cin >> a) {
sum += a;
i++;
}
sum *= 2 << i - 2;
cout << sum << endl;
return 0;
}