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【简答题】
四川汶川抗震指挥部决定建造一批简易房（为长方体状，2.5米），前后墙用2.5米高的彩色钢板，两侧用2.5米高的复合钢板，两种钢板的价格长度来计算（即：钢板的2.5米，用钢板的长度乘以单价就是这块钢板的价格），每米单价：彩色钢板为450元，复合钢板为200元．房顶用其它材料建造，每平方米材料费为200元．每套房材料费控制在32000元以内． （1）设房前面墙的长为x，两侧墙的长为y，所用材料费为p，试用x，y表示p； （2）简易房面积S的最大值是多少？并求当S最大时，前面墙的长度应设计为多少米？
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