I have a directory with 50 workbooks

I need a VBA code to open 12 specific workbooks and paste the value of sheet 1 (a10) into sheet 1 (a2) of the master workbook and then to paste the value of sheet 2 (b10) into sheet 1 (b2) of the master workbook and then to count the number of entries in sheet 3 column E2:E100 and put this number in sheet 1 (c2) of the master workbook. This should be repeated 12 times but the pasted data to be entered below each previous pasted entry