UVA - 11069 - A Graph Problem (Java Solution)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        int[]arr=new int[77];
        arr[1]=1;
        arr[2]=arr[3]=2;
        for(int i=4;i<77;i++){
            arr[i]=arr[i-2]+arr[i-3];
        }
        String m="";
        while ((m=br.readLine())!=null) {
            int x = Integer.parseInt(m);
            sb.append(arr[x]).append("\n");
        }
        System.out.print(sb);
    }
}