#include <iostream>
#include <string>
using namespace std;

int main()
{
	int n;
	cin >> n;
	string S = "";

	while (n >= 2)
	{
		if (n == 3)
		{
			S = "7" + S;
			break;
		}
		S = "1" + S;
		n -= 2;
	}
	cout << S << endl;
}