Calculating number of pixels in polygon using Google Earthy Engine?

How to calculate the number of pixels in a polygon, especially, when an image contains null-value pixels? I tried the function ee.Reducer.countEvery(), but it does not work.

var geometry = /* color: #d63000 */ee.Geometry.Polygon(
    [[[-122.420654296875, 37.96148894979038],
      [-122.530517578125, 37.735934739135104],
      [-122.244873046875, 37.82276800453933],

      [-121.904296875, 37.87481898883636]]]);

// Load a Landsat 8 image.
var image = ee.Image('LANDSAT/LC08/C01/T1/LC08_044034_20140318');


var c=image.reduceRegion({
  reducer: ee.Reducer.countEvery(),
  geometry: geometry
  });


print(c);