0分！！求助！！

#include <bits/stdc++.h>
using namespace std;
double s,sum = 0;
int cnt = 0;
double a = 2;
int main()
{
	cin >> s;
	while (sum >= s)
	{
		sum += a;
		a * 0.98;
		cnt++;
	}
	cout << cnt;
}