def solve(n, x, a):
	if n == 1:
		return a[0] if a[0] <= x else 0
			
	ans = 0
	r = 1
	s = 0
	for l in range(1, n - 1):
		while r < n - 1 and s + a[r] <= x:
			s += a[r]
			r += 1
		if s <= x:
			ans = max(s, ans)
		s -= a[l]
	
	r = 0
	s = sum(a)
	for l in range(n):
		while r <= l and s + a[r] <= x:
			s += a[r]
			r += 1
		if s <= x:
			ans = max(s, ans)
		s -= a[l]
		
	return ans

n, x = [int(y) for y in input().split()]
a = [int(y) for y in input().split()]

print(solve(n, x, a))