The 29th Olympic Games was a complete success in Beijing, China. In this Olympic Games, the Chinese delegation won 51 gold medals, ranking first. The number of gold medals won by the American delegation is that of the Chinese delegation (12/17), and the number of gold medals won by the German delegation is that of the American delegation (4/9). How many gold medals has the German delegation won?
第29届奥运会在中国北京取得了圆满成功，在此次奥运会上中国代表团获得了金牌51枚，居首位．美国代表团获得的金牌数是中国代表团的(12/17)，德国代表团获得的金牌数是美国代表团的(4/9)，德国代表团获得的金牌多少枚？
<gadget id="calculator">12 / 17</gadget>
<output>12/17 = around 0.705882</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">51 * (12/17) * (4/9)</gadget>
<output>16</output>

<result>16</result>