#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

using namespace std;
typedef long long ll;
typedef pair<ll, ll> Pr;

int N;

int main()
{
	cin >> N;
	
	int one = N / 2;
	int seven = 0;
	if (N % 2 == 0)seven = 0;
	else {
		if (N % 2 == 1) {
			seven++;
			one--;
		}
	}

	for (int i = 0; i < seven; i++)
		cout << 7;
	for (int i = 0; i < one; i++)
		cout << 1;
	cout << endl;
	return 0;
}