skip duplicate key error during inserts

Hello,
I have a table like this:
create table dummy (value integer primary key);
and I insert a row like this
insert into dummy values(0);
then I want to insert three rows:
insert into dummy values(0);
insert into dummy values(1);
insert into dummy values(2);

none of them will be inserted because the first insert is a primary key violation. How can I have postgreSQL not mind about the error and proceed to the next insert. I could send the inserts one at a time but bundling them speeds up the process.
Thanks