import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int A = sc.nextInt();
		int B = sc.nextInt();
		int X = sc.nextInt();
		
		int amari = X % A;
		
		if(amari == 0) {
			System.out.println(B * (X / A));
		}else {
			System.out.println(B * (X / A + 1));
		}
		


	}
}