import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################[
n,x,m = na()
a = na()
for i in range(min(n, m)):
    a[i] //= 2

if max(a) < x:
    Yes()
else:
    No()