#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define inf INT_MAX
#define f(i,k,n) for(int i=k; i<n; i++)

void solve()
{
    int n,p;
    cin>>n>>p;
    int x=0, a[n+1];
    a[0]=0;
    f(i,1,n+1)
    {
        cin>>x;
        a[i]=a[i-1]+x;
    }
    int l=0, r=0;
    int maxi=0;
    while(r<=n)
    {
        if(a[r]-a[l]>p) l++;
        if(a[r]-a[l]<=p)
        {
            maxi=max(maxi,r-l);
            r++;
        }
    }
    cout<<maxi<<"\n";
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t=1;
    //cin>>t;
    while(t--)  solve();
    return 0;
}