golfscript, 26 bytes

Result

AC

Duration

1215ms

Code [DL]

n%{.1=\.2=@={1}{4}if=48-}%

stdin

621 229
411 613
633 336
462 763
869 665
452 549
746 728
113 394
421 113
392 928
799 954
466 772
949 993
477 199
298 845
791 794
855 448
933 335
659 686
244 853
742 511
951 519
364 849
814 172
157 754
688 838
922 828
528 559
893 227
467 762
247 885
793 639

stdout

21376573199697875364558178252786

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd76c3edb0 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x564400669d70 /* 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"], 0x564400a26028 /* 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=7, si_stime=2} ---
10    +++ exited with 0 +++