C:\Users\x\Desktop>c.pl

 Press 1 to enter a File or 2 to count Total Combinations:  1


    Enter File Name to count number of LINES (.txt):  s1.txt

    Lines in File s1.txt: 864


 Press 1 to enter a File or 2 to count Total Combinations:  1


    Enter File Name to count number of LINES (.txt):  s2.txt

    Lines in File s2.txt: 864


 Press 1 to enter a File or 2 to count Total Combinations:  1


    Enter File Name to count number of LINES (.txt):  s3.txt

    Lines in File s3.txt: 864


 Press 1 to enter a File or 2 to count Total Combinations:  2

 Total Combinations: 644972544

C:\Users\x\Desktop>