#include <bits/stdc++.h>
#include <iostream>
#include <string>
using namespace std;

int main() {
int n;
cin>>n;
string ans="";

if(n%2==0){
	for (int i = 0; i < n/2; ++i) {
		ans=ans+"1";
	}
	cout<<ans<<endl;
	return 0;
}else{
	ans="7";
	for (int j = 0; j < n/2-1; ++j) {
		ans=ans+"1";
	}
	cout<<ans<<endl;
	return 0;
}


}


/*
2 1
3 7
4 11
5 71
6 111
7 711
8 1111
9 71111
10 11111
*/