import java.util.Scanner;
public class test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int nClassCount = sc.nextInt();
		int maxCount = sc.nextInt();
		
		int []arr = new int[nClassCount];
		for (int i = 0; i < nClassCount; i++) {
			arr[i] = sc.nextInt();
		}
		
		int count = 1;
		int sum = 0;
		for (int i = 0; i < nClassCount; i++) {
			sum += arr[i];
			if (sum <= maxCount) {
				continue;
			}else{
				sum = arr[i];
				count++;
			}
		}
		System.out.println(count);
	}
}