import sys,random
from itertools import permutations
from collections import deque

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

N = int(input()) + 1

for n in range(1,102):
    if N == 10**n:
        print("Yes")
        break
else:
    print("No")