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import java.lang.Math; // headers MUST be above the first class
import java.util.*;

// one class needs to have a main() method
public class Main
{
  public static void main(String[] args)
  {
   	Scanner sc = new Scanner(System.in);
    int case = 1;
    while(sc.hasNextInt()) {
      int m = sc.nextInt();
      BigInteger a = new BigInteger("2");
      BigInteger curA = a.pow(m).subtract(new BigInteger("1"));
      int lo = 0;
      int hi = m;
      int ans = 0;
      while(lo <= hi) {
       	int mid = lo + (hi - lo) / 2;
        if(ok(mid)) {
          ans = mid;
          low = mid + 1;
        }
        else hi = mid - 1;
      }
      System.out.println("Case #" + case + " " + ans);
      case++;
  }
    static boolean ok(int k, BigInteger cc) {
      	BigInteger b = new BigInteger("10");
      	BigInteger res = b.pow(k);
      	int ans = res.compareTo(cc);
      if(ans == -1) {
        return true;
      }
      return false;
    }
}