Multiple Slurs in a bar

i want to play the following:
F A C
in such a way that:
Beat number-1)F is pressed
2)F is still kept pressed
3)A is pressed(F is still kept pressed)
4)C is pressed(F and A are still kept pressed)

or in other words ------in a measure of four beats i need an F(4 beat long),A(2 beat long and starting from 3rd beat) and C(1 beat long and starting at 4th beat).................
and i need it in piano!
i tried and it keeps pressing F 3 times(as 2-1-1) in that measure and A is pressed two times(as 1-1 starting at 3rd beat) in that measure........