```
#include<iostream>
using namespace std;

long long a, b, p, ans = 0;

int main ()
{
	cin >> a >> b >> p;
	while (b)
        {
		if (b & 1) 
                {
                      ans = (ans + a) % p;
                }
		a = (a * 2) % p;
		b >>= 1;
	}
	cout << ans % p;
}
```