#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <map>
#include <queue>
typedef long long ll;
using namespace std;
#define rep(i, n) for (int i = 0; i <= (int)(n); i++)
#define mod 1000000007

int main(){
	int N;
	cin >> N;
	string a;
	string b;
	if(N % 2 == 0){
		while(N % 2 == 0){
			a += "1";
		}
	}
	else if(N % 3 == 0){
		while(N % 3 == 0){
			b += "7";
		}
	}
	int aa = stoi(a);
	int	bb = stoi(b);
	int ans = max({aa, bb});
	cout << ans << endl;
}