daniel@swagg-htpc-01:~/test$ time ./a 
Read n=6314466083072888893799357126131292332363298818330841375588990772701957128924885547308446055753206513618346628848948088663500368480396588171361987660521897267810162280557475393838308261759713218926668611776954526391570120690939973680089721274464666423319187806830552067951253070082020241246233982410737753705127344494169501180975241890667963858754856319805507273709904397119733614666701543905360152543373982524579313575317653646331989064651402133985265800341991903982192844710212464887459388853582070318084289023209710907032396934919962778995323320184064522476463966355937367009369212758092086293198727008292431243681 has 2046 bits.

answer 1=4994097331495993759590792520652782896298040702842052804596091316575363414862676472297324459047461969855851762208911221321241374084825500814598324057817295157460163428748617431743371535373584519311479667686627715728864057273036107427545351441992333703764148710086798963155916759426741193579376396522818496357335032139598670494577520161356987154136310419315797156777208723685881823376284494131513590136899083068033919977865483124290662185228944009736543594763905898717659641198560483737149541481094888019426062490884384838074953205628739379413727850315986194387378032781404281175230300985834217585463046424665894367379
done 40000000 iterations in time=1059 sec.

answer 2=4994097331495993759590792520652782896298040702842052804596091316575363414862676472297324459047461969855851762208911221321241374084825500814598324057817295157460163428748617431743371535373584519311479667686627715728864057273036107427545351441992333703764148710086798963155916759426741193579376396522818496357335032139598670494577520161356987154136310419315797156777208723685881823376284494131513590136899083068033919977865483124290662185228944009736543594763905898717659641198560483737149541481094888019426062490884384838074953205628739379413727850315986194387378032781404281175230300985834217585463046424665894367379
done 40000000 iterations in time=1086 sec.


real    35m44.668s
user    35m43.948s
sys     0m0.067s
daniel@swagg-htpc-01:~/test$ cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 10
model name      : AMD Athlon(tm) XP 2800+
stepping        : 0
cpu MHz         : 2083.052
cache size      : 512 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow 3dnowprefetch vmmcall
bugs            : fxsave_leak sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 4166.10
clflush size    : 32
cache_alignment : 32
address sizes   : 34 bits physical, 32 bits virtual
power management: ts