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()
z = 1
ans = 0
for i in range(n-1,-1,-1):
    while a[i] // z >= x:
        z *= 2
        ans += i + 1
if ans <= m:
    Yes()
else:
    No()