A, B, C = map(int, input().split())
if B == max(A, B, C):
    ans = B - max(A, C)
    ans = min(ans, max(A, C) - min(A, C))
else:
    ans = min(A, C) - B
    ans = min(ans, max(A, C) - min(A, C))
print(ans)