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#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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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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{
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int k;
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cin >> k;
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double sum = 0;
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for (int n = 1;; n++)
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{
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sum += 1.0 / n;
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if (sum > k)
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{
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cout << n;
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break;
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}
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}
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return 0;
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}
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