#18Easy

Distance between two points

Time: 1 s · Memory: 256 MB

Variables and types

Statement

Two points are given on a plane: $A(x_1, y_1)$ and $B(x_2, y_2)$ . Find the distance between them:

$d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$

Input format

A single line with four integers $x_1$ , $y_1$ , $x_2$ , $y_2$ (each at most $1000$ in absolute value).

Output format

A single number — $d$ with exactly 2 digits after the decimal point.

Examples

Input

0 0 3 4

Output

5.00

Input

1 1 4 5

Output

5.00

Note

Square root: Python — math.sqrt, C++ — sqrt (<cmath>), Go — math.Sqrt. You do not need pow to square a number: $(x_2 - x_1)^2$ is simply dx * dx.

Distance between two points

Time: 1 s · Memory: 256 MB

Variables and types

Statement

Two points are given on a plane: $A(x_1, y_1)$ and $B(x_2, y_2)$ . Find the distance between them:

$d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$

Input format

A single line with four integers $x_1$ , $y_1$ , $x_2$ , $y_2$ (each at most $1000$ in absolute value).

Output format

A single number — $d$ with exactly 2 digits after the decimal point.

Examples

Input

0 0 3 4

Output

5.00

Input

1 1 4 5

Output

5.00

Note

Square root: Python — math.sqrt, C++ — sqrt (<cmath>), Go — math.Sqrt. You do not need pow to square a number: $(x_2 - x_1)^2$ is simply dx * dx.