multiple column if statement

I am very new at doing formula in excel. How do I do a if statement that looks at multiple columns.


Example:
A B C
Row1 1982
Row2 1974
Row 3 1982
Row 4 1974

I need a if statement first to read Column A , if there is year in column A then give me the year. If there is not year in column A then look at column B, if there is year in B then give that year, If no year in column B then look at C and then give me the year in C.

Thank you