# -*- coding:utf-8 -*-
# m = [6, 2, 5, 5, 4, 5, 6, 3, 7, 6]
if __name__ == '__main__':
    n = int(input())
    if n % 2 == 0:
        print("1"*int(n/2))
    else:
        print("1"*int((n-3)/2) + "7")