cannot found "KeyValueInputFormat" in Hadoop
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I am newbie to Hadoop but have read the Yahoo tutorial on that and have already written a few  mapReduce jobs. All my previous works used TextInputFormat but I now need to change that to KeyValueInputFormat. The problem is that KeyValueInputFormat.class cannot be found in hadoop 0.20.2? 

I am attaching my code below (It is the word count example with only input format being changed)

    package org.myorg;
    
    import java.io.IOException;
    import java.util.*;
     
    import org.apache.hadoop.fs.Path;
    import org.apache.hadoop.conf.*;
    import org.apache.hadoop.io.*;
    import org.apache.hadoop.mapred.*;
    import org.apache.hadoop.util.*;
     
    public class WordCount {
     
      public static class Map extends MapReduceBase implements Mapper<LongWritable, Text, Text, IntWritable> {
        private final static IntWritable one = new IntWritable(1);
        private Text word = new Text();
     
        public void map(LongWritable key, Text value, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
          String line = value.toString();
          StringTokenizer tokenizer = new StringTokenizer(line);
          while (tokenizer.hasMoreTokens()) {
            word.set(tokenizer.nextToken());
            output.collect(word, one);
          }
            }
          } 
        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));
            }
          }
         
          public static void main(String[] args) throws Exception {
            JobConf conf = new JobConf(WordCount.class);
            conf.setJobName("wordcount");
         
            conf.setOutputKeyClass(Text.class);
            conf.setOutputValueClass(IntWritable.class);
         
            conf.setMapperClass(Map.class);
            conf.setCombinerClass(Reduce.class);
            conf.setReducerClass(Reduce.class);
         
            conf.setInputFormat(keyValueInputFormat.class);  //The modified input format
            conf.setOutputFormat(TextOutputFormat.class);
         
            FileInputFormat.setInputPaths(conf, new Path(args[0]));
            FileOutputFormat.setOutputPath(conf, new Path(args[1]));
         
            JobClient.runJob(conf);
          }
        }