public static class Reduce extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable> {
	     public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
	       int sum = 0;
	       while (values.hasNext()) {
	         sum += values.next().get();
	       }
	       output.collect(key, new IntWritable(sum));
     }
}