Java program to display the Fibonacci series up to a given number

import java.io.*;
class fibonacci
{
public static void main(String args[]) throws IOException
{
System.out.println("Enter a number: ");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int num=Integer.parseInt(br.readLine());
int f1=0,f2=1,f3;
System.out.println("Fibonacci series is: ");
System.out.println(f1);
System.out.println(f2);
for(int i=2;i<num;i++)
{
f3=f1+f2;
System.out.println(f3);
f1=f2;
f2=f3;
}
}
}