package main

import (
	"fmt"
	"io/ioutil"
	"strings"
)

// Returns 0 if we find the end of the path, '.' or '#' otherwise
func getCoords(s []string, x, y int) rune {
	length := len(s)
	if y+1 >= length {
		return 0
	}
	width := len(s[y])
	if y < 0 || x < 0 { // off the map = no tree
		return '.'
	}
	return rune(s[y][x%width])

}

func main() {
	d, _ := ioutil.ReadFile("in3.txt")
	text := string(d)
	lines := strings.Split(text, "\n")
	trees := 0
	x := 0
	y := 0 // start in the top-left corner
	for {
		t := getCoords(lines, x, y)
		//tree := false
		switch t {
		case 0:
			fmt.Println(trees)
			return
		case '#':
			trees += 1
			//tree = true
		}
		//fmt.Printf("in3.txt:%d:%d: %#v\n", y+1, (x%len(lines[y]))+1, tree)
		x += 3
		y += 1
	}
}