时间限制: 2s
内存限制: 192MB 提交: 3844 解决: 2605
题目描述
为鼓励居民节约用水，自来水公司采取按用水量阶梯式计价的办法，居民应交水费y（元）与当月用水量x（吨）相关：当x不超过15吨时，每吨收费2元；超过15吨后对于超出部分按每吨3元收取。请编写程序实现水费的计算，输入用水量与输出收费均以整数计。
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