Adding Lists Together

This is something that should be simple, but the documentation and other questions don't seem to deal with it. I can think of mechanically doing it through a loop, but I know there must be a better way.

In this example, I have three lists (although the actual operation will involve several sets of 20-30 each, and they're much longer):

list1={1,5,5,5,5,6};
list2={2,1,2,2,2,2};
list3={3,3,3,3,3,3};

What I need to do is add them together - as in all the first positions of the three lists being added together, all the second positions, and all the third positions, so that I just have say:

list4={6,9,10,10,10,11};

The actual order of the list is important (I'm using it to store data). Thanks in advance.

Answer

There is another approach (much better) - Total :

Total[{list1, list2, list3}]

{6, 9, 10, 10, 10, 11}

or Apply the function Plus :

Plus @@ {list1, list2, list3}

or

MapThread[ Plus, {list1, list2, list3}]