# Manhattan distance

The streets in the central part of Manhattan are constructed in a way that resembles a grid. To get from one crossroad you need to go parallel in one direction and then vertical in another. So, if we imagine a virtual X and Y axis, in Manhattan, we always move either parallel to the OX axis or parallel to the OY axis.

This construction of streets has become so popular that people started using it as a distance metric. When it’s only allowed to move in the OX or the OY directions and one needs to get from

to

, they first move parallel to the OX axis to get from

to

and afterward from

to

. This changes the calculations of distance between points and is called Manhattan distance. The standard Euclidean distance is

. Can you figure out the Manhattan distance between two points?

The input consists of 4 numbers:

and

coordinates of the first point followed by

and

coordinates of the second point. The program should output the Manhattan distance between those two points.Input | Output |

3
4
1
0.5 | 5.5 |

#### Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB