golfscript, 15 bytes

Result

AC

Duration

1035ms

Code [DL]

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

stdin

549 994
633 342
733 216
788 849
297 267
733 554
744 654
198 891
344 449
442 458
426 523
426 662
534 332
748 257
752 424
714 466
725 446
467 665
147 741
424 217
688 447
916 165
388 887
592 197
947 676
646 176
425 443
577 473
277 184
422 622
232 329
353 368

stdout

93382348445632444674818166477223

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe353c0c10 /* 9 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x561270937d70 /* 9 vars */ <unfinished ...>
13    execve("/usr/local/ruby-2.7.1/bin/ruby", ["/usr/local/ruby-2.7.1/bin/ruby", "/root/golfscript.rb", "/volume/CODE"], 0x5612714f9028 /* 9 vars */ <unfinished ...>
12    <... execve resumed>)             = 0
13    <... execve resumed>)             = 0
12    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=5, si_stime=2} ---
11    +++ exited with 0 +++