try:
    import mydebug

    def dprint(*objects, sep='', end='\n'):
        print(*objects, sep, end)
except:
    def dprint(*objects, sep='', end='\n'): pass

x = int(input())
y = int(input())
k = int(input())

if x == 0 and y >= 0:
    turn = 0
elif y >= 0:
    turn = 1
else:
    turn = 2

dprint( (abs(x)+k-1)//k , (abs(y)+k-1)//k , turn)
ans = abs((abs(x)+k-1)//k) + abs((abs(y)+k-1)//k) + turn
print(ans)