import sys
input = sys.stdin.readline
def read_values(): return tuple(map(int, input().split()))
def read_list(): return list(map(int, input().split()))


def main():  
    n,x=read_values()
    a=read_list()
    ans=0
    a=a+a
    l=0
    t=0
    for i in range(n*2):
        t+=a[i]
        while t>x or i-l>=n:
            t-=a[l]
            l+=1
        ans=max(ans,t)
    print(ans)
            
            
if __name__ == "__main__":
    main()