include<bits/stdc++.h>
using namespace std; int main(){
double x;
while(scanf("%lf",&x)!=EOF){
if(x==0.00) break;
double sum=0.0;
int n=0;
while(sum < x){
n++;
sum += 1.0/(n+1);
}
printf("%d card(s)\n",n);
}
return 0;
}