#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    int niza[n];
    for(int i = 0; i < n; i++) {
        cin >> niza[i];
    }
    int j = 0;
    int sum = 0;
    int rezult = 0;
    for(int i = 0; i < n; i++) {
        while(j < n and sum + niza[j] <= m) {
            if(rezult < j - i + 1) {
                rezult = j - i + 1;
            }
            sum += niza[j];
            j++;
        }
        sum -= niza[i];
    }
    cout << rezult << endl;
    return 0;
}