def match(N):
    if N == 2:
        return 1
    elif N == 3:
        return 7
    elif N >= 4:
        p = N // 2
        q = N % 2
        if q == 0:
            result = '1' * p
            return int(result)
        elif q == 1:
            result = '7' + '1' * (p - 1)
            return int(result)

if __name__ == '__main__':
    N = int(input())
    print(match(N))