include <bits/stdc++.h>

using namespace std;

void _sign(double a) {

double sum=0;
for(int n=1;; n++) {
	sum+=1.0/(n+1);
	if(sum>=a) {
		printf("%d\n",n);
		break;
	}
}

}

int main() {

double c;
while(1) {
	scanf("%lf",&c);
	if(c==0)
		return 0;
	else
		_sign(c);
}
return 0;

}