golfscript, 15 bytes

Result

WA

Duration

943ms

Code [DL]

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

stdin

334 443
322 118
952 822
719 767
235 827
711 751
911 858
588 684
664 636
852 656
747 742
595 883
355 519
711 995
896 967
734 741
277 643
445 577
144 647
624 369
784 447
922 221
348 826
535 539
395 441
839 339
137 337
474 177
227 273
545 487
977 758
699 997

stdout

42878118667551977543428543342579

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd9d730040 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x556a6aa8bd70 /* 9 vars */) = 0
12    execve("/usr/local/ruby-2.7.1/bin/ruby", ["/usr/local/ruby-2.7.1/bin/ruby", "/root/golfscript.rb", "/volume/CODE"], 0x556a6b4a8028 /* 9 vars */) = 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=5, si_stime=3} ---
10    +++ exited with 0 +++