package 算法提高课;
import java.math.BigInteger;
import java.util.Scanner;
public class acw90 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
BigInteger ba = new BigInteger(sc.next());
BigInteger bb = new BigInteger(sc.next());
BigInteger bp = new BigInteger(sc.next());
System.out.println(ba.multiply(bb).mod(bp));
}
}