Sumif with more than one criteria

OK, pls can someone help before my comp goes out of the window!!! I need to
sum up a value if my cells meet 2 Criteria - I thought I had it using an Aray
but juet got the Value error message. Anyways I have 3 col's as below

Town month & Days - I need a formula to add up the days when the town &
Month Match I thought =SUM((A2:A10=”Town X”)*(B2:B10=”Jan”)*C2:C10) would
work giving me the total of Col c when Col A was Town X & B was the month of