#include <iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	bool flg = false;
	int cnt = 0;

	while (n >= 2)
	{
		flg = n == 3 ? true : flg;
		cnt++;
		n -= 2;
	}
	for (int i = 0; i < cnt; i++)
	{
		if (i == 0 && flg)
		{
			printf("7");
			continue;
		}
		printf("1");
	}
	cout << endl;
}