import java.io.*;

public class Ali {

  static public double readValue() {
    StreamTokenizer st = new StreamTokenizer(
                            new BufferedReader(
                               new InputStreamReader(System.in)));
    st.parseNumbers();

    try {
      st.nextToken();
    } catch (IOException e){}

    return st.nval;
  }

  static public int bigger(int a, int b) {
    if ( a > b ) return a;
    return a;
  }

  static public double average(int a, int b) {
    return (a+b)/2.0;
  }

}