#include<iostream>
using namespace std;
typedef unsigned long long ull;
ull a,b,p,res;
int main()
{
    cin>>a>>b>>p;
    while(b)
    {
        if(b&1) res = (res + a)%p;
        b = b / 2; 
        a = (a * 2)%p;
    }
    cout<<res;
}