Algorytm5 Java fast

public class Algorytm5 {
    public static void main(String[] args)
    {

        int a, i, x, suma;

        a = 2;
        i = 0;
        x = 4;
        suma = 0;

        for(;i < 4;)
        {
            i++;
            suma = suma + a;
            a = a + x;
        }

        System.out.println(suma);
    }
}