package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd := bf.NewReader(Stdin)
	var n, x int
	Fscan(rd, &n, &x)
	a := make([]int, n, 2*n)
	for i := range a {
		Fscan(rd, &a[i])
	}
	a = append(a, a...)
	lb, ub, sum, ans := 0, 0, a[0], 0
	for lb < len(a) {
		for lb <= ub && sum > x {
			sum -= a[lb]
			lb++
		}
		ans = max(ans, sum)
		ub++
		if ub >= len(a) {
			break
		}
		sum += a[ub]
		for ub - lb + 1 > n {
			sum -= a[lb]
			lb++
		}
	}
	Println(ans)
}