golfscript, 18 bytes

Result

AC

Duration

989ms

Code [DL]

8/{1>1/.2<~=!3*=}%

stdin

125 271
775 554
755 856
499 883
875 972
395 954
857 718
371 855
343 335
288 539
744 447
788 989
251 593
522 228
357 272
743 443
995 493
233 321
765 828
611 882
358 782
556 995
451 425
699 964
381 811
691 997
861 145
671 174
998 337
378 317
366 959
295 594

stdout

25599978384852244381794989113365

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffeebff32f0 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x564ee5534d70 /* 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"], 0x564ee6747028 /* 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=3} ---
10    +++ exited with 0 +++