Number to words (JAVA)

import java.io.*;

class num2word

{

public static void main(String args[])throws IOException

{

BufferedReader br =new BufferedReader(new InputStreamReader(System.in));

System.out.println("\n\n\n\n\nEnter Amount Less Than 1 CRORE");

        int num=Integer.parseInt(br.readLine());

if(num>=10000000)

{

System.out.print("INVALID AMOUNT!!!!!ENTER AGAIN");

}

String nm[]={"","one ","two ","three ","four ","five ","six ","seven ","eight ","nine ","ten ","eleven ","twelve ","thirteen ","fourten ","fifteen ","sixteen ","seventeen ","eighteen ","nineteen ","twenty "};

String ty[]={"","","twenty ","thirty ","fourty ","fifty ","sixty ","seventy ","eighty ","ninety "};

int s0=num%10;

num=num/10;

int s1=num%10;

num=num/10;

int s2=num%10;

num=num/10;

int s3=num%10;

num=num/10;

int s4=num%10;

num=num/10;

int s5=num%10;

num=num/10;

int s6=num%10;

int a=s6*10+s5;

int b=s4*10+s3;

int c=s1*10+s0;

if(a<21&&a>0)

{

System.out.print(nm[a]+"lakh ");

}

if(a>20&&s6!=0&&s5!=0)

{

System.out.print(ty[s6]+nm[s5]+"lakh ");

}

if(b<21&&b>0)

{

System.out.print(nm[b]+"thousand ");

}

if(b>20&&s4!=0&&s3!=0)

{

System.out.print(ty[s4]+nm[s3]+"thousand ");

}

if(s2!=0)

{

System.out.print(nm[s2]+"hundred ");

}

if(c<20&&c>0)

{

System.out.print(nm[c]);

}

if(c>20&&s1!=0&&s0!=0)

{

System.out.print(ty[s1]+nm[s0]);

}

System.out.print("RUPEES ONLY\n\n\n");

                }

}