package main

import . "fmt"
import . "slices"

func main() {
	var a,b,c int
	Scan(&a,&b,&c)
	x:=[]int{a,b,c}
	Sort(x)
	y:=[]int{
		x[1]-x[0],
		x[2]-x[1],
	}
	Println(Min(y))
}