2965 Kangaroo

2965.java

import java.util.Scanner;

class Main{
    static long[][] d = new long[15][15];
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt(); int b =sc.nextInt(); int c=sc.nextInt();
        int s1, s2;
        s1=b-a; s2=c-b;

        if(s1>s2){
           System.out.println(s1-1);
        }else{
           System.out.println(s2-1);
        }
        sc.close();
    }
}