Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Billy Lucas:  Well what do you want ? SLR 's SMG 's GPMG 's , mortars , grenades , claymores , sidewinders ? You name it , we can supply it .
Dempsey: For our particular purpose , details of which you have no need to know , we require one current model fully armed , fueled and operational tank .
Makepeace: Tank ?
Dempsey: I told you : we can only afford _ one _ !

tank