Count Full-Line Comments

Count how many of the given lines are full-line single-line comments — that is, the first non-whitespace characters on the line are //.

Input: the first line is an integer N; then N lines of text.

Output: one line — the number of full-line // comments.

Example 1

Input

4
// header
int x = 1;
   // indented note
y = 2; // trailing

Output

1 <= N <= 100

Hint 1

line.trim() removes leading spaces so an indented comment still counts.

Hint 2

startsWith("//") on the trimmed line is the test.

Hint 3

A line with code before // does not count.

Trim each line first so indentation does not matter, then check whether it begins with //. A trailing comment after code (like y = 2; // trailing) is not a full-line comment and is not counted.

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Input (stdin)

Output