Footballs are made using a four$-$step process. The leather is cut and stamped with the appropriate logo in the stamping step. This takes $15$ seconds per football, and the process is staffed with six people. In the stitching step, the four panels are sewn together. This takes $25$ seconds per ball, and the process is staffed with nine people. In the bladder insertion step, a rubber inflatable bladder is inserted inside the sewn panels and is partially inflated. This step takes $20$ seconds per ball and is performed by seven people. The final step, lacing, is completely manual, taking $35$ seconds per ball. This step is performed by a staff of twelve. What is the overall process capacity?