package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	var ans int
	for i := 10; i < 100; i++ {
		if i%3 == 0 {
			ans++
		}
		if n == i {
			fmt.Fprintln(writer, ans)
			return
		}
	}
	if n < 300 {
		fmt.Fprintln(writer, ans)
		return
	}
	s := fmt.Sprintf("%d", n)
	l := len(s)
	for i := 1; i < l-2; i++ {
		ans += pow4(l-i-1) * 3
	}
	d := int(s[0] - '0')
	for i := 3; i < d; i += 3 {
		ans += pow4(l - 1)
	}
	if d%3 == 0 {
		dp := makeGrid(l, 2)
		dp[0][0] = 1
		for i := 1; i < l; i++ {
			dd := int(s[i] - '0')
			for j := 0; j < dd; j += 3 {
				dp[i][1] += dp[i-1][0]
			}
			if dd%3 == 0 {
				dp[i][0] += dp[i-1][0]
			}
			dp[i][1] += dp[i-1][1] * 4
		}
		ans += dp[l-1][0] + dp[l-1][1]
	}
	fmt.Fprintln(writer, ans)
}
func pow4(n int) int {
	var ans int = 1
	for i := 0; i < n; i++ {
		ans *= 4
	}
	return ans
}

func makeGrid(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}