题目描述
Problem Statement
Given integers A, X, and $M, find \displaystyle \sum_{i = 0}^{X-1} A^i, modulo M$.
Input
The input is given from Standard Input in the following format:
A X M
Output
Print the answer.
Constraints
- $1 \leq A, M \leq 10^9$
- $1 \leq X \leq 10^{12}$
- All values in the input are integers.
Sample Input 1
3 4 7
Sample Output 1
5
3^0 + 3^1 + 3^2 + 3^3 = 40, which equals 5 modulo 7, so 5 should be printed.
Sample Input 2
8 10 9
Sample Output 2
0
Sample Input 3
1000000000 1000000000000 998244353
Sample Output 3
919667211
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分
样例输入
3 4 7
样例输出
5