// No.965 門松列が嫌い
package main

import (
	"fmt"
	"math"
)

func main() {
	var a, b, c float64
	fmt.Scan(&a, &b, &c)

	dab := math.Abs(a - b)
	dac := math.Abs(a - c)
	dbc := math.Abs(b - c)
	fmt.Println(int(min(dab, dac, dbc)))
}