void Main()
{
	long[] literals = new long[]
	{
		1,
		2
	};

	byte[] instructions = new byte[]
	{
		PUSH, 0,
		PUSH, 1,
		ADD,
		RET
	};

	Compile(literals, instructions).Dump();
}

const byte PUSH = 0;
const byte ADD = 1;
const byte RET = 2;

static long Compile(long[] literals, byte[] instructions)
{
	Stack<long> stack = new Stack<long>();
	int instructionPointer = 0;
	while (true)
	{
	switch (instructions[instructionPointer])
		{
		case PUSH:
			++instructionPointer;
			stack.Push(literals[instructions[instructionPointer]]);
			break;
		case ADD:
			stack.Push(stack.Pop() + stack.Pop());
			break;
		case RET:
			return stack.Pop();
		}
		instructionPointer++;
	}
}