import sys
input = sys.stdin.readline
N, S, B = map(int, input().split())
H = list(map(int, input().split()))
now_s = S
now_h = H[0]
for i in range(N-1):
    if now_s>0:
        now_h += now_s*B
        now_s = 0
    if H[i]+S*B>now_h:
        now_h = H[i]
        now_s = S
        now_h += now_s*B
        now_s = 0
    if now_h<H[i+1]:
        print("No")
        exit()
print("Yes")