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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 K = 0;
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cin >> K;
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float s = 0;
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for (int n = 1;; n++) {
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s += 1 / (1.0 * n);
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if (s > K) {
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cout << n << endl;
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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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