#include <stdio.h>
int main(int argc, char *argv[]) {
float in;
float i;
float sum;
scanf("%f", &in);
while (in != 0.00) {
sum = 0.00;
i = 0.00;
while (sum < in) {
i = i + 1.00;
sum += (1.00 / (i + 1));
}
printf("%d card(s)\n", int(i));
scanf("%f", &in);
}
return 0;
}