#include <iostream>
using namespace std;
int main() {
    int n, m;
    cin >> n >> m;
    int a[100005];
    int s = 0;
    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int j = 0, ret = 0;
    for(int i = 0; i < n; i++) {
        while(j < n and s + a[j] <= m) {
            ret = max(ret, j - i + 1);
            s += a[j];
            j++;
        }
        s -= a[i];
    }
    cout << ret << endl;
    return 0;
}
// 1 2 3 4 5
// a --> b imame tocno b - a + 1