In a building, there were a total of seven floors. The floors were numbered 1 to 7 from bottom to top, floor 1 being the ground floor. Each of the 7 men among A, B, C, D, E, F and G, occupied a floor, not necessarily in the same order. G occupied floor number 4. Only one person lived below the floor occupied by E. B was exactly above A. C was exactly below G. F occupied the topmost floor. Which man occupied floor 1?