翻译一道编程的英文题目

A Bank plans to install a machine for cash withdrawal. The machine is able to deliver appropriate @ bills for a requested cash amount. The machine uses exactly N distinct bill denominations, say Dk, k=1,N, and for each denomination Dk the machine has a supply of nk bills. For example,

N=3, n1=10, D1=100, n2=4, D2=50, n3=5, D3=10

means the machine has a supply of 10 bills of @100 each, 4 bills of @50 each, and 5 bills of @10 each.

Call cash the requested amount of cash the machine should deliver and write a program that computes the maximum amount of cash less than or equal to cash that can be effectively delivered according to the available bill supply of the machine.

Notes:
@ is the symbol of the currency delivered by the machine. For instance, @ may stand for dollar, euro, pound etc.

补充....
三楼的再麻烦一下..
一定加分数.. 谢谢!!
Input
The program input is from standard input. Each data set in the input stands for a particular transaction and has the format:
cash N n1 D1 n2 D2 ... nN DN
where 0 <= cash <= 100000 is the amount of cash requested, 0 <=N <= 10 is the number of bill denominations and 0 <= nk <= 1000 is the number of available bills for the Dk denomination, 1 <= Dk <= 1000, k=1,N. White spaces can occur freely between the numbers in the input. The input data are correct.
Hint
The first data set designates a transaction where the amount of cash requested is @735. The machine contains 3 bill denominations: 4 bills of @125, 6 bills of @5, and 3 bills of @350. The machine can deliver the exact amount of requested cash.

一家银行计划安装一台取款机,这种机器可以根据用户要求吐出适当金额的@现金,它用N种确定面额的钞票,而且Dk面额的有nk张,例如:
N=3,n1=10,D1=100, n2=4, D2=50, n3=5, D3=10

意思是这台机器有10张100@,4张50@,和5张10块@.

为了可以根据要求支付现款,取款机应该有一个程序来计算出最大金额,这个金额应该小于等于取款机根据上面数据可以提供的金额.

注解:
@是取款机可以提供的货币形式,比如,@可以代表美员,欧元,英镑等.

银行计划安装一台机器为现金提款。机器是能够提供适当的@法案所要求的现金数额。

去雅虎那边翻译一下，很好用哦(*^__^*)