package main

import (
	"fmt"
	"math"
	"strings"
)

func main() {
	var n int
	fmt.Scan(&n)
	fmt.Println(matchNum(n, ""))
}

func matchNum(leftMatch int, matchNumMemo string) string {
	if leftMatch < 2 {
		return matchNumMemo
	}
	if leftMatch == 2 {
		return strings.Join([]string{matchNumMemo, "1"}, "")
	}
	if leftMatch == 3 {
		return strings.Join([]string{matchNumMemo, "7"}, "")
	}
	return matchNum(int(math.Ceil(float64(leftMatch/2))), strings.Join([]string{matchNumMemo, "1"}, ""))
}