def work(dis,pri,re):
    sum1=0
    dis-=re*d
    if dis%d==0:
        sum1=dis//d*pri
    else:
        sum1=(dis//d+1)*pri
        re=dis//d+1-dis/d
    return sum1,re
n,d=map(int,input().split())
v=list(map(int,input().split()))
a=list(map(int,input().split()))
i=sum1=0
l=0
flag=0
while i<=len(v)-1:
    
    if i==len(v)-1:
        if l*d<v[i]:
            sum2,l=work(v[i],a[i],l)
    elif flag:
        if a[i]<a[i+1]:
            sum2,l=work(v[i+1],a[i],l)
            flag=0
    elif a[i]>a[i+1]:
        if l*d<v[i]:
            sum2,l=work(v[i],a[i],l)
        else:
            l-=v[i]/d
    else:
        if l*d>=v[i]+v[i+1]:
            l-=(v[i])/d
        else:
            sum2,l=work(v[i]+v[i+1],a[i],l)
            flag=1
    sum1+=sum2
    print(sum1)
    i+=1
print(sum1)
'''
5 4
10 10 10 10
9 8 9 6 5
'''