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  1. or download this
    my $k=1;
for (230000..900000){
...
}
print $k;
# typical alg. for factorial calculation
  2. or download this
    
thread1 : for (230000..565000){
...
             #multiply
          }
  3. or download this
    
thread1 : for (230000..397500,732500..900000){
...
             #multiply
          }
# it will run faster