#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
double len;
double tmp;
int ans;
while( cin >> len, len )
{
tmp = 0;
ans = 1;
while( ans++ )
{
tmp += 1 / ( ans * 1.0 );
if( tmp >= len )
{
cout << ans - 1 << " card(s)" << endl;
break;
}
}
}
return 0;
}




