#include <iostream>

using namespace std;

int n,k;

int main(){
    cin >> n >> k;
    int m = k,res = 0;
    for(int i = 0;i < n;i++){
        int x;
        cin >> x;
        m -= x;
        if(m <= 0){
            res ++;
            m = k;
        } 
    }
    if(m && m != k) res++;
    cout << res << endl;

    return 0;
}