#include "bits/stdc++.h"
using namespace std;

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