package main

import (
	"fmt"
	"strings"
)

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

func matchNum(n int) {
	if n%2 == 1 {
		fmt.Println("7" + strings.Repeat("1", (n/2)-1))
	} else {
		fmt.Println(strings.Repeat("1", n/2))
	}
}