a, b, c = int(input()), int(input()), int(input())
if (a > b and a > c) or (c > a and c > b):
if a > c:
if b > c:
result = a - c
else:
result = a - b
else:
if b > a:
result = c - a
else:
result = c - b
else:
if a > c:
result = b - c
else:
result = b - a
print(result)