Background

Description

Say that a "clump" in an array is a series of 2 or more adjacent elements of the same value. Return the number of clumps in the given array.

Format

Input

Output

Samples

[1 2 2 3 4 4]

2

[1 1 2 1 1]

2

[1 1 1 1 1]

1

Limitation

1s, 1024KiB for each test case.