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OI-codes/AcWing/90/90.cpp

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#include <bits/stdc++.h>
using namespace std;
long long bintimes(long long a, long long b, long long m) {
a %= m;
long long res = 0;
while (b > 0) {
if (b & 1) res = (res + a) % m;
a = (a + a) % m;
b >>= 1;
}
return res;
}
int main() {
long long a, b, p;
cin >> a >> b >> p;
cout << bintimes(a, b, p) << endl;
return 0;
}