import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        new Main();
    }
    
    public Main() {
        try (Scanner sc = new Scanner(System.in)) {
            int A = sc.nextInt(), B = sc.nextInt(), C = sc.nextInt();
            System.out.println(Math.min(Math.min(Math.abs(B - A), Math.abs(C - A)), Math.abs(C - B))); // どれかを同値にするのが最適なので
        }
    }
}