import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
#input = sys.stdin.readline
#n = int(input())
#alist = list(map(int,input().split()))
#alist = []
n,s,b = map(int,input().split())
h = list(map(int,input().split()))
dp = [0 for j in range(n)]
now = h[0] + s*b
dp[0]=1
for i in range(1,n):
    if now >= h[i]:
        now = max(now,h[i]+s*b)
        dp[i] = 1
print('Yes' if dp[-1] else 'No')