N,M,L=map(int,input().split())
A=list(map(int,input().split()))

color = set()
color.add(L)
for a in A:
    new = set()
    new.add(a)
    for c in color:
        new.add(c)
        new.add((a+c)//2)
    color = new

print("Yes" if M in color else "No")