include <bits/stdc++.h>

using namespace std; double f(double c) {

double total=0,i=2;
int num=0;
while(total<c)
{
	total=total+1/i;
	i++;
	num++;
}
return num;

} int main() {

double c;
while(c!=0.0)
{
	cin>>c;
	if(f(c)==0)
	{
		continue;
	}
	cout<<f(c)<<endl;
}
return 0;

}