ACM (TJU) : 1920


// http://acm.tju.edu.cn/toj/showp1920.html

#include <stdio.h>

int main ()
{
    double n;

    while ( scanf ("%lf", &n) && n ) {

        double result = 0;
        int count = 1;

        while ( result < n ) {
            result += (1.0/(count + 1));
            count++;
        }

        printf ("%d card(s)\n", count - 1);
    }

    return 0;
}
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