	// _________________________RATHOD_____________________________________________________________
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.Scanner; 
import java.util.StringTokenizer; 
import java.util.*;  
public class Main 
{ 
    static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    } 
  
    public static void main(String[] args) 
    { 
        FastReader sc=new FastReader(); 
        int n=sc.nextInt();
        long k=sc.nextLong();
        long arr[]=new long[n];
        for(int i=0;i<n;i++)
        arr[i]=sc.nextInt();
        long count=0;
        long r=0;
        for(int i=0;i<n;i++)
        {
            if(r+arr[i]==0)
            continue;
            if((r+arr[i])%k==0)
            {
            count=count+(r+arr[i])/k;
            r=0;
            }
            else if(((r+arr[i])/k)>0)
            {
                count=count+(r+arr[i])/k;
                r=(r+arr[i])%k;
            }
            else 
            {
                count=count+1;
                r=0;
            }
            
        }
        if(r!=0)
        count=count+1;
        System.out.println(count);
    }        
      
    
     
} 