Integer calculation with long

JavaLongCalc.java

public class JavaLongCalc {
    public static void main(String[] args) {
        final long x = 50  * 1024  * 1024  * 1024;
        final long y = 50L * 1024  * 1024  * 1024;
        final long z = 50L * 1024L * 1024L * 1024L;

        System.out.println(x);
        System.out.println(y);
        System.out.println(z);
    }
}

-2147483648
53687091200
53687091200