Multiple Find/Replace

I'm trying not to do find and replace hundreds of times, working with 3 columns of data.

In column C, I want to find each value that's in column A and replace it with the B column value that's in the same row as A.

A B C
1 10 1
2 19 1
3 15 2
4 13 2

Would become

C
10
10
19
19

Thanks for your help,
Chris