Several boxes are arranged in a row. Xiaohua put more than 50 same table tennis balls in the boxes, only one of which had no table tennis balls, and then he left. At this time, Xiao Zhuang took out a ping-pong ball from each box with ping-pong balls and put them in the box, and then rearranged the boxes, but when he came back, he found that no one had touched these boxes and the ping-pong balls inside. How many boxes are there in total?
若干个盒子排成一排．小华把50多个同样的乒乓球分别放在盒子中，其中只有1个盒子里没有乒乓球，然后他有事离开了．这时，小壮从每个有乒乓球的盒子里各取出1个乒乓球放在盒子里，再把盒子重排一下，结果回来没发现有人动过这些盒子和里面的乒乓球．则共有多少个盒子．
<result>11</result>