package main

import "fmt"

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}
func abs(a int) int {
	if a >= 0 {
		return a
	}
	return -a
}

func main() {
	var A, B, C int
	fmt.Scan(&A, &B, &C)
	fmt.Println(min(abs(A-B), min(abs(B-C), abs(A-C))))
}