if x==0 :
    if y==0:
        print(0)
    elif y>0:
        print(math.ceil(y/z))
    else:
        print(math.ceil(abs(y)/z)+2)
else:
    if y>=0:
        print(math.ceil(y/z)+math.ceil(abs(x)/z)+1)
    else:
        print(math.ceil(abs(y)/z)+math.ceil(abs(x)/z)+2)