import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;

public class Sim {

    private final int[] mem = new int[1 > 16 & 0xF;
        int src2 = ir >> 20 & 0xF;
        int op = ir >> 24 & 0xF;
        int dst = ir >> 28 & 0xF;

        int src1v = regs[src1];
        int src2v = regs[src2];

        alu[0] = src1v + src2v;
        alu[1] = -src1v;
        alu[2] = src1v & src2v;
        alu[3] = src1v | src2v;

        int res = alu[op];

        regs[dst] = res;

        char c = (char) (regs[OUT] & 0x7f);
        if(c != 0)
            writer.append(c);

        if(dst != PC)
            regs[PC]++;

        regs[PC] = (regs[PC]) & 0xffffff;
    }
}