#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>
#include<functional>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;

int main(void) {
	int n;

	cin >> n;
	switch (n) {
	case 3:
		cout << 7 << endl;
		break;
	default:
		FOR(i, 1, n / 2) {
			cout << 1;
		}
		cout << endl;
		break;
	}

	return 0;
}