#!/usr/bin/env python3 from sys import argv i = [x.strip() for x in open(argv[1])] h = len(i) w = len(i[0]) def check(dx, dy): x = 0 y = 0 ok = 0 while y < h: if i[y][x%w] == "#": ok += 1 x += dx y += dy return ok print(check(3,1)) print(check(1,1)*check(3,1)*check(5,1)*check(7,1)*check(1,2))