AtCoder Regular Contest 107
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Problem Statement
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Given are three positive integers $A$, $B$, and $C$. Compute the following value modulo $998244353$:
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$\sum_{a=1}^{A} \sum_{b=1}^{B} \sum_{c=1}^{C} abc$
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Constraints
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$1 \leq A, B, C \leq 10^9$
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Input
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Input is given from standard input in the following format:
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A B C翻译中…
Output
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Print the value modulo $998244353$.
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样例
Input #1
1 2 3
Output #1
18
We have: $(1 \times 1 \times 1) + (1 \times 1 \times 2) + (1 \times 1 \times 3) + (1 \times 2 \times 1) + (1 \times 2 \times 2) + (1 \times 2 \times 3) = 1 + 2 + 3 + 2 + 4 + 6 = 18$.
Input #2
1000000000 987654321 123456789
Output #2
951633476
Be sure to compute the value modulo $998244353$.
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。