import sys
input = lambda:sys.stdin.readline().strip()

n,s = map(int,input().split())
a = [0] + list(map(int,input().split()))

i = j = 1
ans = 0
sum = a[i]

while(j<=n):
    if sum <= s:
        ans=max(ans,j-i+1)
        j+=1
        if j<=n:sum+=a[j]
    else:
        sum-=a[i]
        i+=1     
print(ans)