Among the given
N natural numbers, determine how many of them are pairs of identical numbers standing side by side.
Input
The first line contains a natural number
N - the number of numbers. In the second line -
N natural numbers (
\(2<=N<=100\), all numbers do not exceed 100 ).
Imprint
Print a single number - the number of pairs of identical numbers standing side by side.
Examples
| # |
Input |
Output |
| 1 |
5
1 3 2 2 3
|
1 |
| 2 |
4
1 1 1 1
|
3 |