The Rolling Department of Jabari Steel Company had $800$ tons in beginning work in process inventory $(60\%$ complete$)$ on October $1.$ During October, $15,600$ tons were completed. The ending work in process inventory on October $31$ was $1,200$ tons $(25\%$ complete$).$

What are the total equivalent units for direct materials for October if materials are added at the beginning of the process?

$x$ units