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#include <bits/stdc++.h>
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using namespace std;
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/*
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NOIP
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CCF 组织的赛事都可以了
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__int128取值范围−2^127~2^127−1
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__int128只能通过字符形式输入输出
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*/
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typedef long long LL;
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LL a, b, p, res;
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int main() {
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cin >> a >> b >> p;
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cout << (LL)(__int128(a) * (__int128)b % p) << endl;
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return 0;
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}
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