Arithmetic progression

gistfile1.java

import java.io.*;
import java.lang.Math;

public class Solution {
 public static void main(String args[] ) throws Exception {
 String line = null;
  try {
    BufferedReader is = new BufferedReader(new InputStreamReader(System.in));
    line = is.readLine();
    line = is.readLine();
    String[] splitted = line.split(" ");
    int[] numbers = new int[splitted.length];
    int k=0;
    for (String s : splitted){
       numbers[k] = Integer.valueOf(s);
       k++;
    }
    int first = numbers[1]-numbers[0];
    int last = numbers[numbers.length-1]-numbers[numbers.length-2];
    int offset = Math.min(first,last);
    int found = 0;
    for (int i=0; i<numbers.length-1;i++){
    if (numbers[i]+offset==numbers[i+1])
      continue;
    else{
      found=numbers[i]+offset;
      break;
    }
  }
   System.out.println(found);
  } catch (NumberFormatException ex) {
   System.err.println("Not a valid number: " + line);
  } catch (IOException e) {
   System.err.println("Unexpected IO ERROR: " + e);
}
}
}