UVA - 11161 - Help My Brother (II)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        BigInteger arr[] = new BigInteger[1501];
        BigInteger sum[] = new BigInteger[1501];
        arr[0] = BigInteger.ZERO;
        sum[0]=BigInteger.ZERO;
        arr[1] = BigInteger.ZERO;
        sum[1]=BigInteger.ZERO;
        arr[2] = BigInteger.ONE;
        sum[2]=BigInteger.ONE;
        arr[3] = BigInteger.valueOf(2);
        sum[3]= BigInteger.valueOf(3);
        for (int i = 4; i < 1501; i++) {
            arr[i] = arr[i - 2].add(arr[i - 1]);
            sum[i]=sum[i-1].add(arr[i]);
        }
        int i=1;
        while (true) {
            int m = Integer.parseInt(br.readLine());
            if (m == 0) {
                break;
            }
            BigInteger two=BigInteger.valueOf(2);
            sb.append("Set ").append(i).append(":\n");
            if((arr[m].mod(two)).compareTo(BigInteger.ZERO)==0){
                sb.append(sum[m-1].add(arr[m].divide(two))).append("\n");
            }else{
                sb.append(sum[m-1].add((arr[m].add(BigInteger.ONE)).divide(two))).append("\n");
            }
            i++;
        }
        System.out.print(sb);
    }
}