package main

import (
	"fmt"
)

func resolve(N int) int64 {
	if N < 2 {
		return 0
	}
	var r int64
	if N%2 == 1 {
		r = 7
	} else {
		r = 1
	}
	N -= 2
	for {
		if N < 2 {
			break
		}
		r = r*10 + 1
		N -= 2
	}
	return r
}

func main() {
	var N int
	fmt.Scanf("%d\n", &N)
	fmt.Println(resolve(N))
}