A simple Java program demonstrating math with integers.

DavidA.java

class Ideone
{
	public static void main (String[] args)
	{
		int A, B, C, D;
		
		A = 1; B = 2;  C = 3;  D = 4;
        if (A + C == D) D = D - 2;
        if (2 * D + 4 * A < 10) A = A + 4;
        if (A + D > 3 * B + C) B = C - A;
        if (B < C) C = B;
        System.out.println(A + B + C + D);
	}
}