The following people work in the white house: a senator, his assistant and his secretary. their names are jones, robinson and smith. (not in that order). there are also three secret service agents working in the white house, with corresponding names: mr. jones, mr. robinson and mr. smith.

mr. robinson lives on washington street.

the senator lives halfway between washington st. and state st.

mr. jones earns exactly 100 k a year.

smith once beat the senator's assistant at chess.

the senator's next-door neighbor, one of the secret service agents, earns exactly three times as much as the senator.

the agent living on state st. has the same name as the senator.

what is the secretary's name?