countline

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int countline(ifstream& fin) {
  int n = 0;
  string line;
  while(getline(fin, line)) n++;
  return n;
}
int main(int argc, char **argv) {
  ifstream fin(argv[1]);
  cout << countline(fin) << endl;
}