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#include <bits/stdc++.h>
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using namespace std;
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double k;
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double x;
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int main() {
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cin >> k;
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for (int cnt = 1;; cnt++) {
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x += 2.0 * pow(0.98, cnt - 1);
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if (x >= k) {
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cout << cnt << endl;
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exit(0);
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}
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}
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}
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