N = int(input())
result = []
if N == 0 or N == 1:
    print(0)
elif (N-3)%2 == 0:
    result = [7] + [1]*((N-3)//2)
    print("".join(map(str,result)))
else:
    result = [1]*(N//2)
    print("".join(map(str,result)))