import java.util.Scanner;

public class Main {
  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    double a = sc.nextDouble(), b = sc.nextDouble(), c = sc.nextDouble(), d = sc.nextDouble(), e = sc.nextDouble();
    double[] arrayNumbers = {a,b,c,d,e};
    //System.out.print(Arrays.toString(arrayNumbers));
    double max = arrayNumbers[0];
    for (int i =1; i < arrayNumbers.length; i++)
    {
      if (arrayNumbers[i] > max)
      {
        max = arrayNumbers[i];
      }
    }
    System.out.println((int)max);
    sc.close();
  }
}