n,s=map(int,input().split())
if n==1:
    if 25<=s<30:
        print('Yes')
        exit()
    else:
        print('No')
        exit()
f=False
for i in range(25,30):
    total=s-i
    if s<0:
        continue
    if (total)//(n-1)<i:
        f=True
        break
print('Yes' if f else 'No')