import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	if N % 2 == 1:
		ans = "7" + "1" * ((N - 2) // 2)
	else:
		ans = "1" * int(N // 2)

	print(ans)


if __name__ == '__main__':
	main()