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#!/usr/bin/env ruby
class Machine
def initialize(starting_memory = [])
@mem = starting_memory
@pc = 0
@halt = false
end
def mem(start = 0, len = @mem.length)
@mem[start...(start + len)]
end
def halt!
@halt = true
end
def halt?
@halt
end
def step
return if halt?
case @mem[@pc]
when 1
@mem[@mem[@pc+3]] = @mem[@mem[@pc+1]] + @mem[@mem[@pc+2]]
@pc += 4
when 2
@mem[@mem[@pc+3]] = @mem[@mem[@pc+1]] * @mem[@mem[@pc+2]]
@pc += 4
when 99
halt!
@pc += 1
end
end
def run
until halt? do
step
end
end
end
input = $stdin.readlines[0].strip.split(",").map(&:to_i)
input[1] = 12
input[2] = 2
m = Machine.new(input)
m.run
puts m.mem(0, 1)
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