Display nth Fibonacci number- Java Program

import java.util.*;

class Test{

public static void main(String args[]){

System.out.println("Which fibonnacii number you want");

Scanner sc= new Scanner(System.in);

int n= sc.nextInt();

int next=0;

int a=0;

int b=1;

if(n==1 ) System.out.println(0);

else if(n==2) System.out.println(1);

else

{

for(int i=3;i<=n;i++)

{

next=a+b;

a=b;

b=next;

}

System.out.println(next);

}

}}