These problems are from the atcoder DP contest, and were transferred onto DMOJ. All problem statements were made by several atcoder users. As there is no access to the test data, all data is randomly generated. If there are issues with the statement or data, please contact or on slack.
There is a tree with vertices, numbered . For each , the -th edge connects Vertex and .
Taro has decided to paint each vertex in white or black. Here, it is not allowed to paint two adjacent vertices both in black.
Find the number of ways in which the vertices can be painted, modulo .
- All values in input are integers.
- The given graph is a tree.
The first line will contain the integer .
The next lines will each contain 2 space separated integers .
Print the number of ways in which the vertices can be painted, modulo .
Sample Input 1
3 1 2 2 3
Sample Output 1
Explanation For Sample 1
There are five ways to paint the vertices, as follows:
Sample Input 2
4 1 2 1 3 1 4
Sample Output 2
Explanation For Sample 2
There are nine ways to paint the vertices, as follows:
Sample Input 3
Sample Output 3
Sample Input 4
10 8 5 10 8 6 5 1 5 4 8 2 10 3 6 9 2 1 7
Sample Output 4