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18 lines
245 B
C++
18 lines
245 B
C++
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// R38780934
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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long long sum, a, i;
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sum = a = i = 0;
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while (cin >> a) {
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sum += a;
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i++;
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}
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sum *= 2 << i - 2;
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cout << sum << endl;
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return 0;
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}
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