Fibonacci Series in Java

import java.io.*;
class Fib
{
    public static void main(String args[]) throws IOException
    {
        int n,f1,f2,f3;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter no.of elements in Fibonacci series: ");
        n = Integer.parseInt(br.readLine());
        f1=0;
        f2=1;
        if(n>0)
        {
            System.out.println("Fibonacci Series:");
            for(int i=0; i<n; i++)
            {
                System.out.println("\t"+f1);
                f3=f1+f2;
                f1=f2;
                f2=f3;
            }
        }
        else
            System.out.println("You Entered the Wrong Number...");

    }
}

 OUTPUT:

Enter no.of elements in Fibonacci series:
6
Fibonacci Series:
        0
        1
        1
        2
        3
        5