class AnalyticalEngine:
    """A small, readable simulation."""

    def __init__(self, registers: int = 16) -> None:
        self.registers = [0] * registers
        self.pc = 0

    def load(self, index: int, value: int) -> None:
        self.registers[index] = value

    def run(self, program: list[tuple[str, int, int]]) -> None:
        while self.pc < len(program):
            op, a, b = program[self.pc]
            if op == "add":
                self.registers[a] += self.registers[b]
            elif op == "store":
                self.registers[a] = b
            self.pc += 1