AtCoder Beginner Contest 179
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Problem Statement
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Let us denote by $f(x, m)$ the remainder of the Euclidean division of $x$ by $m$.
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Let $A$ be the sequence that is defined by the initial value $A_1=X$ and the recurrence relation $A_{n+1} = f(A_n^2, M)$. Find $\displaystyle{\sum_{i=1}^N A_i}$.
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Constraints
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$1 \leq N \leq 10^{10}$$0 \leq X < M \leq 10^5$- All values in input are integers.
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Input
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Input is given from Standard Input in the following format:
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N X M
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Output
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Print $\displaystyle{\sum_{i=1}^N A_i}$.
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样例
Input #1
6 2 1001
Output #1
1369
The sequence $A$ begins $2,4,16,256,471,620,\ldots$ Therefore, the answer is $2+4+16+256+471+620=1369$.
Input #2
1000 2 16
Output #2
6
The sequence $A$ begins $2,4,0,0,\ldots$ Therefore, the answer is $6$.
Input #3
10000000000 10 99959
Output #3
492443256176507
题目信息
题面与样例版权归 AtCoder 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。