import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, K = getlist()
	A = getlist()
	A.sort()
	ans = 0
	for i in range(1 << N):
		val = K
		for j in range(N - 1):
			if ((i >> j) & 1) == 1:
				val %= A[-1 - j]

		val %= A[0]
		ans = max(ans, val)

	print(ans)

if __name__ == '__main__':
	main()