n, m = map(int, input().split())
A = list(map(int, input().split()))
A.sort(reverse = True)
dp = [[0] * (m + 1) for _ in range(n + 1)]
for i in range(n - 1):
    d = A[i] - A[i + 1]
    for j in range(m + 1):
        dp[i + 2][j] = dp[i + 1][j]
        if j >= d:
            dp[i + 2][j] = max(dp[i + 2][j], dp[i][j - d] + A[i])

print(dp[-1][-1])