Rank Tên đăng nhập Điểm Bài tập ▾ Giới thiệu
18601 101 1
18601
PY2FNguyenMinhHien
Nguyễn Minh Hiền
101 1

Tôi là ...

18601 101 1

A coder

18601 101 1

111 222 333
tk22VuongHoangViet is mine

18605 1301 1
18606 101 1
18607 201 1
18607
j
201 1
18609 101 1
18610 201 1
18611 1701 1
18612
nqminhhnvn
Nguyễn Quang Minh, AMS
501 1
18613 14 1
18614 101 1
18614 101 1
18616 150 1
18617 1501 1
18618 63 1
18619 150 1
18620 120 1
18621 101 1
18622 1601 1
18623 101 1
18624 630 1
18625 254 1
18626 1200 1
18627 201 1
18628 101 1
18629 801 1
18630 301 1
18631 158 1
18632 1040 1
18633 401 1
18634 200 1
18635 1801 1
18635 1801 1
18637 101 1
18637 101 1
18639 150 1
18640 101 1
18641 800 1
18642 201 1
18643 1601 1
18644 101 1

Huỳnh Tấn Mạnh

18645 1697 1
18646 43 1
18647 201 1
18648 801 1
18649 167 1
18650 301 1
18651 100 1
18652
Papaya 1029
620 1
18653 801 1
18654 2 1
18655 101 1
18656 257 1
18657 1 1
18658 101 1
18659 401 1
18660 1701 1
18661 201 1
18662 301 1
18663 101 1

bachtran

18664 5 1

chả có gì cả :))

18665 201 1
18666 40 1
18667 101 1
18668 93 1
18669
huevan
Phan Thị Huệ
451 1
18670 101 1
18671 901 1
18672 40 1
18673 301 1
18674 240 1
18675 101 1
18676 201 1

12

18677 1601 1
18678 320 1
18679 2501 1
18680 101 1
18681 201 1
18681 201 1
18683 1501 1
18684 201 1
18685 501 1
18686 101 1
18687 301 1
18688 250 1

DPNTG

18689 101 1
18689 101 1

jhh

18691 60 1
18692 287 1

n, m = map(int, input().split())

i = 1
sum = 0
while True:
t = n - i
if t == 0:
break
sum += t

i += 1

t = m - i
if t == 0:
    break
sum += t

t = n - i
if t == 0:
    break

sum += t
i += 1

t = m - i
if t == 0:
    break
sum += t

print(sum)

18693 451 1
18694 201 1
18694 201 1
18696 51 1
18697
linh1405
Luna
201 1
18698 101 1
18699
hamy24042007
hwy.07
201 1
18700 301 1