l=[]
sum=0
f = open('dream_team_10k.txt', 'r')
for line in f:
    line=line.split()
    l.append(line)
n=int(l[0][0])
k=int(l[0][1])
print(n)
print(k)
m=l[1]
print(m)
for i in range(len(m)):
    m[i]=int(m[i])
print(m)
m.sort()
m=m[::-1]
#print(m)
new1_sum=m[0]
ch=1
for i in range(0,n):
    max=m[i]
    if ch==n-2:
        break
    else:
        j=ch
    new_sum=new1_sum
    #print(i)
    while new_sum==new1_sum and j<n-1:
        if m[j]+m[j+1]+k>=max:
            new_sum+=m[j]
        j+=1
        #print(j)
    for d in range(j-1,n-1):
        if m[d]+m[d+1]+k>=max:
            new_sum+=m[d+1]
            #print(new_sum)
        else:
            #print(new_sum)
            ch=d
            break
    if new_sum>sum:
        sum=new_sum
    new1_sum=new_sum-m[i]
print(sum)