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;

}