package main

import "fmt"

type Solution struct{}

func (s Solution) IsPowerOfThree(n int) bool{
	if n <= 0{
		return false
	}
	if n == 1{
		return true
	}
	if n % 3 != 0{
		return false
	}
	return s.IsPowerOfThree(n/3)
}

func main(){
	solution := Solution{}

	fmt.Println(solution.IsPowerOfThree(27))
	fmt.Println(solution.IsPowerOfThree(0))
	fmt.Println(solution.IsPowerOfThree(-1))
}