import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input())
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

n,x,m = list(map(int, input().split()))
a = LI()
vs = []
for v in a:
    val = 0
    while v>=x:
        v //= 2
        val += 1
    vs.append(val)
c = 0
mm = 0
for i in range(n)[::-1]:
    v = vs[i]
    if v>mm:
        c += (v-mm) * (i+1)
        mm = v
pans(c<=m)