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18 lines
228 B
C++
18 lines
228 B
C++
// R38781374
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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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int n, sum;
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sum = 1;
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cin >> n;
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for (int i = n - 1; i > 0; i--) {
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sum++;
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sum *= 2;
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}
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cout << sum;
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return 0;
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}
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