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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;
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cin >> n;
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int res = 0;
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for (int i = 1, k = 0; k < n; i++)
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for (int j = 0; j < i && k < n; j++, k++)
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res += i;
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cout << res << endl;
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return 0;
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} |
