#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	int N;
	cin >> N;
	int t = 0;
	if (N % 2 == 1) {
		cout << 7;
		t = 3;
	}
	for (int i = 0; i < (N-t) / 2; i++) cout << 1;
	cout << endl;

	return 0;
}