n,x,m=map(int,input().split())
def f(y):
    c=int((y:=int(y)//x)>0)
    while(y:=y//2)>0:
        c+=1
    return c
s=0
for e in map(f,input().split()[::-1]):
    if e>s:
        m-=(e-s)*n
        s=e
    n-=1
print("YNeos"[m<0::2])