import sys
mod = 998244353
mod2 = 10**9+7

N, S, B = map(int, input().split())
H = list(map(int, input().split()))
h = H[0]
for i in range(1, N):
    if h >= H[i]:continue
    if (H[i] - h + B-1) // B > S:exit(print("No"))
    h = H[i]
print("Yes")