const fs = require('fs')
const readline = require('readline');

const readInterface = readline.createInterface({
    input: fs.createReadStream('input'),
    console: false
});


// array of arrays of bool. Coordinates are [y][x]. True = tree.
let map = [];

readInterface.on('line', function(line) {
  let row = [];
  
  line.split('').forEach(function(char) {
    if (char == '.') {
      row.push(false);
    } else if (char == '#') {
      row.push(true);
    }; // ignore any other character
  });
  
  console.log(line);
  console.log(row);

  map.push(row);
});

readInterface.on('close', function(line) {
  let treesHit = 0;
  let x = 0;
  let y = 0;

  while (y + 1 < map.length) {
    x += 3;
    y += 1;

    if (x + 1 > map[y].length) {
      x -= map[y].length;
    }

    if (map[y][x]) {
      treesHit++;
    }

    console.log(x, y, map[y][x]);
  }

  console.log(treesHit);
});