Minecraft Stone Counter!

Steve is looking at a row of N blocks. Each block is either "STONE" or "DIRT".
Steve only needs to count the STONE blocks so he knows how many he can mine for building.

Your Task

Given N blocks (each either STONE or DIRT), count and print the number of STONE blocks.

Input Specification

Line 1: integer N
Line 2: N words, each either STONE or DIRT, space-separated

Output Specification

A single integer: the count of STONE blocks.

Sample Input

5
STONE DIRT STONE STONE DIRT

Sample Output

3

Constraints

~1 <= N <= 10000~
Each word is either STONE or DIRT.