The steel bar raw material is each 7.3 meters long, and each set of steel bar frames uses a section of 2.4 meters, 2.1 meters and 1.5 meters long steel bars. Now it is necessary to tie up 100 sets of steel frames, at least how many raw materials will be used?
钢筋原材料每根长7.3米，每套钢筋架子用长2.4米、2.1米和1.5米的钢筋各一段．现需要绑好钢筋架子100套，至少要用去原材料多少根？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 + 33 + 1</gadget>
<output>84</output>

<result>84</result>