Formula where result on Sheet 2 is generated from data on sheet 1

I have a spreadsheet comprising two “sheets”. Sheet 1: Column A has a name, column B a number [1, 2 or 3][ The names and numbers remain the same in their respective Rows] and column C is either blank or has a number 1,12,13 or 16.
In sheet 2: Column A and B have identical information to sheet 1. For column C. I am looking for a formula that, if column C on Sheet 1 contains a number will insert the number shown in column B of the same row on Sheet 1. If Column C in Sheet 1 contains no number Column C in sheet 2 will be blank. Column C represents a week in the year and at the year end the spreadsheet will contain 54 columns.
Eg. Sheet 1: Column A; Column B; Column C;.
Row 1 A Brown 3 16
Row 2 G Green 2
Row 3 D Fellows 1 12

Sheet 2: Column A; Column B; Column C;
Row 1 A Brown 3 3
Row 2 G Green 2 BLANK
Row 3 D Fellows 1 1

Is anyone able to provide me with a formula that would achieve the above?
Your help would be appreciated.

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Isn't this basically the same thing that you are asking about in the thread "Merging two current spreadsheets"?