n,a,b,x,y=list(map(int,input().split()))
h=list(map(int,input().split ()))
for j in range(a):
    mi=h.index(max(h))
    h[mi]-=x
i=[k for k in h if k>0]
if sum(i)>b*y:
    print("No")
else:
    print("Yes")