include <bits/stdc++.h>

using namespace std; int main() {

double c;
while (cin >> c && c != 0.0) {
	double sum = 0.0;
	int n = 0;
	int i = 2;
	while (sum < c) {
		sum += 1.0 / i;
		n = i - 1;
		i++;
	}
	cout << n << endl;
}
return 0;

}