from itertools import accumulate

N,S,B=(int(x) for x in input().split())
H=list(map(int, input().split()))
now_H=H[0]
max_H=list(set(accumulate(H, lambda x,y: max(x,y))))
for i in range(1,len(max_H)):
    if max_H[i]-max_H[i-1] <= S*B:
        continue
    else:
        print("No")
        exit()

print("Yes")