import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int m = sc.nextInt();

int n = sc.nextInt();

int classes[] = new int[m];

int remain = n;

int needCarNums = 1;

for (int i = 0; i < m; i++) {

classes[i] = sc.nextInt();

if (classes[i] > remain) {

remain = n;

needCarNums++;

}

remain -= classes[i];

}

System.out.println(needCarNums);

}

}