#include 
#include 
#include 
#include 
#include 
using namespace std;

typedef long long ll;
int main() {
    ios_base::sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    vector v(n);
    
    for(int i = 0; i < n; i++) {
        cin >> v[i];
    }
    
    int R = 0;
    int sum = 0;
    int res = 0;
    for(int L = 0; L < n; L++) {
        while(R < n and sum + v[R] <= m) {
            sum += v[R];
            R++;
        }
        res = max(res, R - L);
        sum -= v[L];
    }
    
    cout << res << endl;
    return 0;
}