学步园

//POJ1003
#include<iostream>
#include<cstdio>
#include<string>
#include<cstdlib>
#include<cstring>
using namespace std;
int main(){
while(1){
float a,sum;
int n;
        sum = 0.0;
        cin >> a;
if(a==0.00)
break;
//注意下整型转化为浮点数就可以了
        for(n=1;sum<=a;n++)
            sum += 1/((n+1)*1.0);
        cout << n-1 << " card(s)" << endl;
    }
return 0;
}