With 5v 1A you will probably get only one working.
AFAIK those servo's draw around 600mah on (heavy) load.
That is 1.8A when all three are busy..
And those wallsocket AC/DC adapters usually have a great voltage droppage when you pull this much Ampere.
So ONE servo will probably work, and with two both will probably try to work and stop/reset all the time because of the voltage drop.
The cheapest way to get those bastards running is using some battery (nimh or lipo) that can handle those Amp. surges.
Or you should buy some decent power supply like a 'lab power supply' that can handle 2A+ but those things are expensive (but they will also be your best friend for life).
What i'm trying atm. (to get 12 servo's running: 6A) is modding an old ATX PC Powersupply that has 3.3v 5v and 12v output. THe 5v output can draw up to 21A (!!). Check out this link for a HOWTO:http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply
edit: i see that you're trying to get 5 of them running, that is 3A, so a lab power supply, battery or the atx mod is your only answer. 5 on a wallsocket dc adapter will never work.
Only (maybe) an 15v 1A wall adapter and by putting a (5v or 6v 1A+) voltregulator before each servo, but things will get pretty hot and it will consume lots of wattage.