#include<bits/stdc++.h>//万能头文件

using namespace std;
int a[100001] = {0};

int main() {

    int m;
    int n;
    cin >> n >> m;

    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

    int count = 0;
    int sum = 0;

    for (int i = 0; i < n; i++) {
        if (sum + a[i] > m) {
            count++;
            sum = 0;
        }
        sum += a[i];
    }
    if (sum) {
        count++;
    }
    cout << count << endl;
    return 0;
}