TLE了，求解

#include <bits/stdc++.h>
using namespace std;
 
double n,sum=0,jl=0;
void shi_jian(int x){
	if(jl==n){
		return;
	}
	sum++;
	jl+=x*sum;
	shi_jian(x*=0.98);
}
int main(){
	cin>>n;
	shi_jian(2);
	cout<<sum;
}