// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);cin.tie(NULL);
	int n,p;cin >> n>>p;int ans = 0,current = 0;int size = 0;
    queue<int>nums;
    for(int i = 0;i < n;i++){
       int temp;cin >> temp;size++;
       current+= temp;
       nums.push(temp);
       while(current > p){
            current -= nums.front();
            size--;
            nums.pop();
       }
       ans = max(size,ans);
    }
    cout << ans;

}