package main

import (
	"io/ioutil"
	"log"
	"strconv"
	"strings"
)

func main() {
	content, err := ioutil.ReadFile("input.txt")
	if err != nil {
		log.Print(err)
		return
	}
	lines := strings.Split(string(content), "\r\n")
	numbers := make([]int, len(lines))

	for i := 0; i < len(numbers); i++ {
		number, err := strconv.Atoi(lines[i])

		if err != nil {
			log.Print(err)
			return
		}

		numbers[i] = number
	}

	var num1 int
	var num2 int

twoNumLoop:
	for i := 0; i < len(numbers); i++ {
		for j := i + 1; j < len(numbers); j++ {
			if numbers[i]+numbers[j] == 2020 {
				num1 = numbers[i]
				num2 = numbers[j]
				break twoNumLoop
			}
		}
	}

	log.Printf("First Number: %d", num1)
	log.Printf("Second Number: %d", num2)

	log.Printf("%d * %d = %d", num1, num2, num1*num2)

	var num3 int

threeNumLoop:
	for i := 0; i < len(numbers); i++ {
		for j := i + 1; j < len(numbers); j++ {
			for k := j + 1; k < len(numbers); k++ {
				if numbers[i]+numbers[j]+numbers[k] == 2020 {
					num1 = numbers[i]
					num2 = numbers[j]
					num3 = numbers[k]
					break threeNumLoop
				}
			}
		}
	}

	log.Printf("First Number: %d", num1)
	log.Printf("Second Number: %d", num2)
	log.Printf("Third Number: %d", num3)

	log.Printf("%d * %d * %d = %d", num1, num2, num3, num1*num2*num3)
}