#!/usr/bin/env python3


def minimize_cost(a, b, c):
    cost = min(b - a, b - c, abs(c - a))
    return cost


def main():
    a, b, c = (int(z) for z in input().split())
    cost = minimize_cost(a, b, c)
    print(cost)


if __name__ == "__main__":
    main()