Lisas_Workbook.py

# Enter your code here. Read input from STDIN. Print output to STDOUT
def lisas_workbook(n,k,a):

    num_special=0
    cur_page=1

    for i in range(len(a)):

        num_probs_in_chapter=a[i]
        num_full_pages, leftover_probs = divmod(num_probs_in_chapter, k)

        total_pages = num_full_pages + ( 1 if leftover_probs else 0 )
        problems_in_chapter=iter(range(1, a[i]+1))

        for _ in range(total_pages):
            probs_on_page = [next(problems_in_chapter, None) for _ in range(k)]    
            if cur_page in probs_on_page:
                num_special+=1
            cur_page+=1        
    return num_special

def splitit(a):
    l = []
    for i in a:
        l += [int(i)]
    return l
n = splitit(raw_input().split())
l = splitit(raw_input().split())

print lisas_workbook(n[0],n[1],l)