#include <stdio.h>
#include <stdlib.h>

int main() {
	int n, k, i, j = 1, s = 0;

	scanf("%d", &n);
	k = n / 2;
	for (i = 0; i < k; i++) {
		s = s * 10 + 1;
		j *= 10;
	}
	if (n % 2 == 1)
		s += 6 * j / 10;
	printf("%d\n", s);

	return EXIT_SUCCESS;
}