Export.image.toDrive({
  image: Malawi,
  description: '10_M',
  scale: 30,
  fileFormat: 'GeoTIFF',
  maxPixels: 120568920794 ,
  folder : '2010_Malawi'
});

var countries = ee.FeatureCollection('ft:1tdSwUL7MVpOauSgRzqVTOwdfy17KDbw-1d9omPw');
var Malawi = countries.filter(ee.Filter.eq('Country', 'Malawi'));
var landsat = ee.ImageCollection('LANDSAT/LE07/C01/T1_SR');

var Malawi = landsat
.filterBounds(Malawi)
.filterDate('2010-01-01', '2010-12-31')
.select(['B1', 'B2', 'B3'])
.median();