aoc2019_02_part1.py

M,p=map(int,open("input.txt").read().split(',')),0
M[1:3]=12,2
while M[p]!=99:o,a,b,r=M[p:p+4];a,b=M[a],M[b];M[r]=a*b if o-1else a+b;p+=4
print M[0]