#include <iostream>
#include <fstream>
using namespace std;

 bool isInlier(string str)
 {
    int len = str.length();
    int len2 = len /2 ;
    for (int index = 0; index < len2; index++){
       if (str.at(index) != str.at(len - index -1)) return  false;
    }

    return true;
 }

int main(int argc, char **argv)
{
    std::ifstream infile(argv[1]);

    string line;
    int nInliers = 0;

    while (std::getline(infile, line))
    if(isInlier(line))nInliers++;

    cout << nInliers;

     return 0;
}