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20 lines
331 B

#include <bits/stdc++.h>
using namespace std;
int main() {
float x;
cin >> x;
float pre = 2;
float sum = 2;
for (int i = 2;; i++) {
sum += pre * 0.98;
pre = pre * 0.98;
if (sum > x) {
cout << i << endl;
break;
}
}
return 0;
}