#include<bits/stdc++.h> using namespace std; int main() { int a = 0; float b = 2,c = 0,s; cin>>s; while(true) { c += b; b *= 0.98; a += 1; if(c >= s) { cout<<a; break; } } return 0; }

`

#include <bits/stdc++.h> 
using namespace std;
int main(){
	double k = 2.0 , x ,l = 0.0;
    cin >> x;
    for(int i = 1;;i ++){
        l += k;
        if(l > x || l == x){
            cout << i;
            break;
        }
        k *= 0.98;
    }
    return 0;
}