#!/usr/bin/env python import sys def count_trees(right, down, lines): n = 0 for i, line in enumerate(lines[::down]): c = line[(i*right) % len(line)] if c == '#': n += 1 return n if __name__ == '__main__': lines = [line.strip() for line in sys.stdin.readlines()] print(count_trees(3, 1, lines)) hits_multiplied = 1 for slope in ((1,1), (3,1), (5,1), (7,1), (1,2)): hits_multiplied *= count_trees(*slope, lines) print(hits_multiplied)