class Conditions
{
    void IncrOrDecr(bool inc, ref int x)
    {
        if (inc)
            x++;
        if (!inc)
            x--;
    }

    int M1(bool b)
    {
        var x = 0;
        if (b)
            x++;
        if (x > 0)
            if (!b)
                x--;
        return x;
    }

    int M2(bool b1, bool b2)
    {
        var x = 0;
        if (b1)
            if (b2)
                x++;
        if (b2)
            x++;
        return x;
    }

    int M3(bool b1)
    {
        var x = 0;
        var b2 = false;
        if (b1)
            b2 = b1;
        if (b2)
            x++;
        if (b2)
            x++;
        return x;
    }

    int M4(bool b, int x)
    {
        var y = 0;
        while (x-- > 0)
        {
            if (b)
                y++;
        }
        return y;
    }

    int M5(bool b, int x)
    {
        var y = 0;
        while (x-- > 0)
        {
            if (b)
                y++;
        }
        if (b)
            y++;
        return y;
    }

    int M6(string[] ss)
    {
        var b = ss.Length > 0;
        var x = 0;
        foreach (var _ in ss)
        {
            if (b)
                x++;
            if (x > 0)
                b = false;
        }
        if (b)
            x++;
        return x;
    }

    int M7(string[] ss)
    {
        var b = ss.Length > 0;
        var x = 0;
        foreach (var _ in ss)
        {
            if (b)
                x++;
            if (x > 0)
                b = false;
            if (b)
                x++;
        }
        return x;
    }

    string M8(bool b)
    {
        var x = b.ToString();
        if (b)
            x += "";
        if (x.Length > 0)
            if (!b)
                x += "";
        return x;
    }

    void M9(string[] args)
    {
        string s = null;
        for (var i = 0; i < args.Length; i++)
        {
            var last = i == args.Length - 1;
            if (!last)
                s = "";
            if (last)
                s = null;
        }
    }

    private bool Field1;
    private bool Field2;

    void M10()
    {
        while (true)
        {
            if (Field1)
            {
                if (Field2)
                {
                    Field1.ToString();
                }
            }
        }
    }

    void M11(bool b)
    {
        var s = b ? "a" : "b";
        if (b)
            System.Console.WriteLine($"a = {s}");
        else
            System.Console.WriteLine($"b = {s}");
    }
}