import sys


def _solve(A, B, C):
    return min(
        abs(A - B),
        abs(B - C),
        abs(C - A),
    )


def solve(in_):
    A, B, C = map(int, next(in_).split())
    return _solve(A, B, C)


def main():
    answer = solve(sys.stdin.buffer)
    print(answer)


if __name__ == '__main__':
    main()