Kaesong Central Primary School holds a flag-raising ceremony every Monday, and each class is arranged in a square matrix of 4 rows and 10 rows. Now there are 15 square formations in total. How many students are there in total?
开城中心小学每周一举行升旗仪式，每个班都排列成4列10排的方阵．现总共有15个方阵，请问总共有多少名同学？
<gadget id="calculator">4 * 10 * 15</gadget>
<output>600</output>

<result>600</result>