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