from sys import stdin
def main():
    #入力
    readline=stdin.readline
    a,b,c=map(int,readline().split())
    n=min(a,c)
    m=max(a,c)

    if max(a,b,c)==b:
        print(min(b-m,m-n))
    elif min(a,b,c)==b:
        print(min(m-n,n-b))

if __name__=="__main__":
    main()