c.js

var c = function(){ $('div#bigCookie').click(); };
setInterval(c, 1);

var g = function(){$('div#goldenCookie').click();};
setInterval(g, 5000);

var u0 = function(){$('div#upgrade0').click();};
setInterval(u0, 1000);

var calculator = function() {
  var efficiency = new Array(10);
  var max = -1;
  var maxidx = 0;
  for(i=0; i<10; i++) {
    var info = $('div#rowInfoContent' + i).innerText.split(/\n/);
    var num = parseInt(info[0].replace(/^.* ([0-9,.]+) .*$/, "$1").split(",").join(""));
    var produce = parseInt(info[1].replace(/^.* ([0-9,.]+) .*$/, "$1").split(",").join(""));
    var price = parseInt($('div#product' + i).textContent.replace(/^[^0-9]+([0-9|,]+)$/, "$1").split(",").join(""));
    var efficiency = 1.0 * produce / num / price;

    if (efficiency > max) {
      maxidx = i;
      max = efficiency;
    }
  }
  console.log("buy: " + maxidx + " efficiency: " + max);
  $('div#product' + maxidx).click();
}
setInterval(calculator, 1000);