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
  });

  map.push(row);
});


readInterface.on('close', function(line) {
  let totals = [];

  [[1,1], [3,1], [5,1], [7,1], [1,2]].forEach(function(step) {

    let treesHit = 0;
    let x = 0;
    let y = 0;

    while (y + 1 < map.length) {
      x += step[0];
      y += step[1];

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

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

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

    totals.push(treesHit);
  }); 

  console.log(totals.reduce((a,b) => a * b));
});