WA
#include<bits/stdc++.h>
using namespace std;
int n,m,ans,sum,a[200005];
signed main(){
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
cin>>n>>m;
for(int i=1;i<=n;i++)cin>>a[i];
for(int i=1,j=1;i<=n;i++){
while(j<=n&&sum<=m){
sum+=a[j];
j++;
}
ans=max(ans,j-i);
sum-=a[i];
}
cout<<ans<<endl;
return 0;
}