Vector length

Calculate the length of the vector.

Specifications

Input

Four integers x₁, y₁, x₂, y₂ - the coordinates of the beginning and end of the vector, respectively. All input data dp not exceed 10000 by absolute value.

Output

One number - the length of a given vector up to the sixth decimal place.

Problem information

Time Limit: 1 seconds
Memory Limit: 64 MB
Balls for the passed test: 5
Complexity: 3% 228/235
Classes: Geometry

Example

Example input

1 1 2 2

Example output

1.414214

← The angle between the vectors

Problems

Accessory points on the line →