Suppose that the microwave radiation has a wavelength of 12 cm. How many photons are required to heat 295 mL of coffee from 25.0 C to 62.0 C?

Suppose that the microwave radiation has a wavelength of 12 cm. How many photons are required to heat 295 mL of coffee from 25.0 C to 62.0 C? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 J/(g/ K), as water over this temperature range.I am not sure how to find the answer