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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 = 2.0; // x代表上一步走的距离
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double s = 2.0; //已经走过的距离是2
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int n = 1; //表示已经走完第1步
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int main() {
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cin >> k; //要走多远
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while (true) {
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n++;
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x *= 0.98; //每次是在上一步距离上 * 0.98
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s += x; //累加距离
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if (s >= k) { //达标
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cout << n << endl;
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break;
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}
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}
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}
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