n,s,b=map(int,input().split())
H=list(map(int,input().split()))

cur_s,cur_h=s,H[0]
for i in range(1,n):
    if cur_h>=H[i]:continue
    else:
        stamina_needed=(H[i]-cur_h+b-1)//b
        if cur_s-stamina_needed<0:
            print('No')
            exit()
        
        cur_s=s
        cur_h=H[i]

print('Yes')