# coding : utf-8

N = int(input())

ans = 1
if N%2==0:
	cnt = int(N/2)-1
	for i in range(0,cnt,1):
		ans = 10*ans + 1
else:
	cnt = int((N-3)/2)-1
	ans = ans + 6
	for i in range(0,cnt-1,1):
		ans = 10*ans + 1
	
print(ans)