Problems

# The biggest party of the quadrilateral

Problems in the plane quadrilateral coordinates of its vertices. Calculate the length of the longest side of the quadrangle.

#### Input

In a single line separated by spaces X and Y coordinates of vertices of the quadrilateral: first, the point A, then B, then C and D. All input data are integers not exceeding modulo 100.

#### Output

A single number - the length of longest side. The result is output to two decimal places.

Time limit 1 second
Memory limit 64 MiB
Input example #1
3 5 6 6 7 2 1 1

Output example #1
6.08