#include <iostream>

using namespace std;

int main(){
	int a = 0;
	cin >> a;
	
	if (a >= 2)
	{
		if (a == 3)
		{
			cout << 7;
		}
		else
		{
			for (int i = 0; i < a / 2; i++)
			{
				cout << 1;
			}
		}
	}
	cout << endl;
	return 0;
}