from functools import reduce
n= int(input())

def max_num(n):
	max= []
	if n % 2 ==0:
		while n > 2:
			max.append(1)
			n -= 2
	else:
		max.append(7)
		n -= 3
		while n > 2:
			max.append(1)
			n == 2
		
	new_max = int(reduce(lambda x, y: x + y, [str(x) for x in max]))
	print(new_max)
	
max_num()