#include 
using namespace std;

int prefix_sum[100001];
int suma(int i, int j) {
    if(i == 0) {
        return prefix_sum[j];
    }
    return prefix_sum[j] - prefix_sum[i - 1];
}
int main()
{
    int n, m;
    cin >> n >> m;
    int niza[n];
    int sum = 0;
    for(int i = 0; i < n; i++) {
        cin >> niza[i];
        sum += niza[i];
        prefix_sum[i] = sum;
    }
    int rezult = 0;
    for(int i = 0; i < n; i++) {
        int S = i + 1;
        int E = n - 1;
        while(S <= E) {
            int middle = (S + E) / 2;
            sum = suma(i, middle);
            if(sum <= m) {
                if(rezult < middle - i + 1) {
                    rezult = middle - i + 1;
                }
                S = middle + 1;
            }
            else {
                E = middle - 1;
            }
        }
    }
    cout << rezult << endl;
    return 0;
}