#include <iostream>
using namespace std;
int main() {
int n, m;
cin >> n >> m;

int niza[n];

int pref_sum[n];
int sum = 0;
for(int i = 0; i < n; i++) {
cin >> niza[i];

sum += niza[i];
pref_sum[i] = sum;
}
int res = 0;
for(int i = 0; i < n; i++) {
int L = i, R = n - 1;
int idx = -1;
while(L <= R) {
int middle = (L + R) / 2;

if(i == 0) {
sum = pref_sum[middle];
}
else {
sum = pref_sum[middle] - pref_sum[i - 1];
}

if(sum <= m) {
if(middle > idx) {
idx = middle;
}
L = middle + 1;
}
else {
R = middle - 1;
}

}
if(idx - i + 1 > res) {
res = idx - i + 1;
}
}

cout << res << endl;


return 0;
}