#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <cmath>
#include <stack>
#include <set>
#include <map>
typedef long long ll;
typedef unsigned int uint;
using namespace std;

vector <int> ans;
int n;

int main() {
	cin >> n;

	while (n > 3) {
		ans.push_back(1);
		n -= 2;
	}

	if (n == 3)
		ans.push_back(7);
	else
		ans.push_back(1);

	for (auto i = ans.begin(); i < ans.end(); i++) {
		cout << *i;
	}
	cout << endl;
}