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

int main(){
	int n;
	cin >> n;
	while(n > 1){
		if(n % 2 == 0){
			n -= 2;
			cout << 1;
		}
		else{
			n -= 3;
			cout << 7;
		}
	}
	cout << endl;
	return 0;
}