AoC2020/03-2-1.py
2020-12-04 20:29:19 +01:00

4 lines
113 B
Python

d=list(open(0))
f=lambda y,x=1:sum(d[i][i*y//x%31]<'.'for i in range(0,323,x))
print(f(1)*f(3)*f(5)*f(7)*f(1,2))