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; }