INF = 10 ** 18

#入力
n, m = map(int, input().split())
a = list(map(int, input().split()))

a.sort() 

#配列の初期化
dp = [[INF] * (m + 1) for i in range(n + 1)] #dp配列
dp[0][0] = 0
w = [a[i + 1] - a[i] for i in range(n - 1)] #重さ
v = [a[i] for i in range(n - 1)] #価値

#ナップサックdpの計算
for i in range(n):
    for j in range(m + 1):
        if i < n - 1 and j + w[i] <= m:
            dp[i + 2][j + w[i]] = dp[i][j] + v[i]
        dp[i + 1][j] = max(dp[i + 1][j], dp[i + 1])

ans = 0

for i in range(m + 1):
    ans = max(ans, dp[n][i])

print(ans)