```
输入4:
30
794 1690
551 3373
3281 1586
690 3891
982 4747
1843 3312
4104 67
485 3114
4189 3368
480 4859
4882 4390
2343 2548
4883 278
3024 2255
3696 99
195 2208
1414 4897
600 1797
1480 2404
593 3443
1589 4402
2071 4591
320 1084
3462 2825
2833 4325
1326 2544
2616 4583
469 4605
2879 415
4646 1388
```
```
输出4:
1171
```
by zyj_Orz @ 2018-09-22 16:50:46
```
输入5
40
1592 46
3337 4211
658 3235
3581 4206
1447 1323
915 1989
2932 2764
100 824
4144 1849
23 732
3389 2848
1350 3518
3675 1442
4810 2166
1243 3780
2880 1980
2960 4480
2861 3194
1115 4457
4763 3400
2235 2245
4232 4892
3497 581
1487 3835
4068 2059
1982 3377
4405 1248
2906 1566
4408 4827
3462 2942
3626 3298
2506 2666
4780 1152
3219 1974
2119 3094
3031 2374
95 2350
1507 3580
3300 1439
1450 1917
```
```
输出5:
1277
```
by zyj_Orz @ 2018-09-22 16:51:53
@[龟龟号打捞船](/space/show?uid=36482) @[kkksc03](/space/show?uid=1)
by zyj_Orz @ 2018-09-22 16:52:33
```
输入6
40
49441 59933
34301 70276
10837 8229
23862 7389
45597 28323
47269 44145
45946 2690
52256 77516
52168 25679
34513 17701
71723 11301
29404 7780
34869 78723
71353 20827
64495 42961
56311 35834
8018 7965
73558 28184
57139 37539
79907 67291
11955 72371
69450 3004
12999 40665
49244 13347
9905 62324
67840 69194
64585 32911
45528 11197
32574 2657
5533 78605
55794 29863
36283 33606
57764 4047
69310 29239
78041 1330
68464 18459
937 61192
28798 75529
58399 59999
13730 27152
```
```
输出6
18923
```
by zyj_Orz @ 2018-09-22 16:53:44
@[老k](/space/show?uid=8943)
by zyj_Orz @ 2018-09-22 16:54:10
如果还要我就再发$qwq$
要的话@我,我再发
by zyj_Orz @ 2018-09-22 17:00:13
样例是给你理解题意的,不是用来测试的
by Lstdo @ 2018-09-22 17:05:07
呸!说错了,是“测试数据”
by zyj_Orz @ 2018-09-22 17:12:17
# 测试数据!
by zyj_Orz @ 2018-09-22 17:12:48
大佬你的数据我都过了,可是为什么交上去零分???
by w_x_c_q @ 2018-09-29 11:12:03