{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0 Arial;}}
{\*\generator Msftedit 5.41.15.1503;}\viewkind4\uc1\pard\f0\fs20 #include <fstream.h>\par
ifstream f("fact.in");\par
ofstream g("fact.out");\par
main()\par
\{\par
 long a,p,i,sw=0,k;\par
 f>>p;\par
 i=0;\par
 k=0;\par
 while (sw==0 && p>=i)\par
  \{\par
   i=i+5;\par
   a=i;\par
   while (a%5==0)\par
      \{\par
       k++;\par
       a=a/5;\par
      \}\par
   if (k==p)\par
     sw=1;\par
    \}\par
  if (sw==1)\par
    g<<i;\par
  else \par
   g<<"-1"; \par
  f.close();\par
  g.close();\par
\}\par
}