Three blocks with masses m1 = 25 kg, m2 = 10 kg and m3 = 15 kg are stacked on top of each other as shown below. A fourth mass, m4 = 16 kg, is suspended by a rope that is attached to m1 via an ideal pulley. An additional applied force Fapp = 3 N pulls down on m4, as seen below. Assuming that m1 is evenly supported between m2 and m3, what is the normal force provided by the floor on m3? (Note: Answer in units of Newtons.)