Total Sales of Supply Chain (2

输入描述:

Each input file contains one test case.  For each case, the first line contains three positive numbers: N (<=105), the total number of the members in the supply chain (and hence their ID's are numbered from 0 to N-1, and the root supplier's ID is 0); P, the unit price given by the root supplier; and r, the percentage rate of price increment for each distributor or retailer.  Then N lines follow, each describes a distributor or retailer in the following format:
Ki ID[1] ID[2] ... ID[Ki]
where in the i-th line, Ki is the total number of distributors or retailers who receive products from supplier i, and is then followed by the ID's of these distributors or retailers.  Kj being 0 means that the j-th member is a retailer, then instead the total amount of the product will be given after Kj.  All the numbers in a line are separated by a space.

输出描述:

For each test case, print in one line the total sales we can expect from all the retailers, accurate up to 1 decimal place.  It is guaranteed that the number will not exceed 1010.

10 1.80 1.00
3 2 3 5
1 9
1 4
1 7
0 7
2 6 1
1 8
0 9
0 4
0 3

42.4