N,S,B=map(int,input().split())
H=list(map(int,input().split()))
curh=H[0]
curs=S
for i,h in enumerate(H[1:],1):
    if h<=curh+B*curs:
        curh+=B*curs
        curs=0
    else:
        curh=H[i-1]
        curs=S
        if h<=curh+B*curs:
            curh+=B*curs
            curs=0
        else:
            exit(print("No"))
print("Yes")