Count Commented Lines

You are given several lines of source code. Your task is to count how many lines are commented. A line is considered a comment if, after removing any leading and trailing white spaces, it starts with the string //.

Formally, let \(L\) be the list of code lines. For each line \(l \in L\), if \(l\) trimmed starts with the string //, then it is a comment line. Your job is to compute the total number of such comment lines.

Note: The input will be given from standard input and the output should be printed to standard output.

inputFormat

The input is taken from stdin and it has the following format:

• The first line contains an integer \(n\) denoting the number of lines of code.
• The following \(n\) lines each contain a string representing a line of code.

Constraints: \(1 \le n \le 10^4\)

outputFormat

Print a single integer to stdout which represents the total number of commented lines.

## sample

7
#include 
// This is a comment
int main() {
    // Another comment
    std::cout << "Hello, World!";
    return 0;
}

2

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