題解（爲什麽是繁體字）

#include <iostream>
using namespace std;

int main() {
    double s;
    cin >> s;
    
    double step_distance = 2.0;
    double total_distance = 0.0;
    int steps = 0;
    
    while (total_distance < s) {
        total_distance += step_distance;
        step_distance *= 0.98;  
        steps++;
    }
    
    cout << steps << endl;
    return 0;
}