This Program is wrong or right.

Question

import java.io.*;
public class Number
{
public static void main (String args[])throws IOException
{
InputStreamReader read = new InputStreamReader(System.in);
BufferedReader in = new BufferedReader(read);
int a,b,c;
System.out.println("enter three numbers");
a=Integer.parseInt(in.readLine());
b=Integer.parseInt(in.readLine());
c=Integer.parseInt(in.readLine());
if(a!=b!=c)
{
System.out.println("greatest number");
}
else
{
System.out.println("they are equal");
}
}
}