N,S,B = map(int,input().split())
H = list(map(int,input().split()))
dame = 0
h = H[0]+S*B
M = H[0]
for a in range(N-1):
    if H[a+1] > M:
        if H[a+1]-h > 0:
            dame += 1
        else:
            h = H[a+1] + S*B
            M = H[a+1]
    
    
if dame >= 1:
    print("No")
else:
    print("Yes")