#include <iostream>
#include <iomanip>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
#include <map>
#include <stack>
#include <functional>
#include <complex>
#include <cmath>
#include <ccomplex>
using namespace std;

int main() {
	//2->1, 3->7, 4->11, 5->71, 6->111, 7->711, 8->1111, 9->7111
	int n;
	cin >> n;

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

	cout << endl;
}