golfscript, 16 bytes

Result

AC

Duration

869ms

Code [DL]

8/{..2=?2*=}%''+

stdin

786 613
433 884
633 614
485 678
121 119
354 781
788 499
425 276
855 115
682 825
899 995
219 168
266 646
296 996
586 565
188 789
618 874
566 673
624 224
511 112
655 785
318 215
792 526
847 116
755 656
249 494
168 861
618 662
297 795
337 239
735 552
638 643

stdout

63361782589169588621525154867256

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdef28b110 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55abef36ed70 /* 9 vars */ <unfinished ...>
12    execve("/usr/local/ruby-2.7.1/bin/ruby", ["/usr/local/ruby-2.7.1/bin/ruby", "/root/golfscript.rb", "/volume/CODE"], 0x55abefcfb028 /* 9 vars */ <unfinished ...>
11    <... execve resumed>)             = 0
12    <... execve resumed>)             = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=6, si_stime=1} ---
10    +++ exited with 0 +++