1 #include <iostream> 2 #include <cstring> 3 #include <cstdlib> 4 #include <cstdio> 5 #include <cmath> 6 #include <cctype> 7 #include <algorithm> 8 #include <numeric> 9 10 #define eps 1e-811 using namespace std;12 13 double len[500];14 15 int main () {16     ios :: sync_with_stdio(false);17     len[0] = 0;18     for (int i = 1; i < 300; ++ i) {19         len[i] = len[i - 1] + 1.0 / (double)(i + 1);20     }21 22     //cout << len[273] << endl;23     double n;24     while (cin >> n) {25         if (n - 0 < eps) {26             break;27         }28         //cout << lower_bound(len, len + 300, n) - &len[0] << endl;29         printf ("%d card(s)\n", lower_bound(len, len + 300, n) - &len[0]);30     }31     return 0;32 }