Score : 200 points
Niwango created a playlist of N songs. The title and the duration of the i-th song are s_i and t_i seconds, respectively. It is guaranteed that s_1,\ldots,s_N are all distinct.
Niwango was doing some work while playing this playlist. (That is, all the songs were played once, in the order they appear in the playlist, without any pause in between.) However, he fell asleep during his work, and he woke up after all the songs were played. According to his record, it turned out that he fell asleep at the very end of the song titled X.
Find the duration of time when some song was played while Niwango was asleep.
Input is given from Standard Input in the following format:
N s_1 t_1 \vdots s_{N} t_N X
Print the answer.
3 dwango 2 sixth 5 prelims 25 dwango
30
sixth
and prelims
.1 abcde 1000 abcde
0
15 ypnxn 279 kgjgwx 464 qquhuwq 327 rxing 549 pmuduhznoaqu 832 dagktgdarveusju 595 wunfagppcoi 200 dhavrncwfw 720 jpcmigg 658 wrczqxycivdqn 639 mcmkkbnjfeod 992 htqvkgkbhtytsz 130 twflegsjz 467 dswxxrxuzzfhkp 989 szfwtzfpnscgue 958 pmuduhznoaqu
6348