import java.util.*;
import java.io.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);

        int A = Integer.parseInt(sc.next());
        int B = Integer.parseInt(sc.next());
        int T = Integer.parseInt(sc.next());

        int times = (2 * T + 1) / (2 * A);
        int num = B * times;
        out.printf("%d\n", num);
        out.flush();
    }
} import java.util.*; util.* java import java.io.*; io.* java class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);

        int A = Integer.parseInt(sc.next());
        int B = Integer.parseInt(sc.next());
        int T = Integer.parseInt(sc.next());

        int times = (2 * T + 1) / (2 * A);
        int num = B * times;
        out.printf("%d\n", num);
        out.flush();
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);

        int A = Integer.parseInt(sc.next());
        int B = Integer.parseInt(sc.next());
        int T = Integer.parseInt(sc.next());

        int times = (2 * T + 1) / (2 * A);
        int num = B * times;
        out.printf("%d\n", num);
        out.flush();
    } main {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);

        int A = Integer.parseInt(sc.next());
        int B = Integer.parseInt(sc.next());
        int T = Integer.parseInt(sc.next());

        int times = (2 * T + 1) / (2 * A);
        int num = B * times;
        out.printf("%d\n", num);
        out.flush();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) PrintWriter out = new PrintWriter(System.out); out new PrintWriter(System.out) int A = Integer.parseInt(sc.next()); A Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int B = Integer.parseInt(sc.next()); B Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int T = Integer.parseInt(sc.next()); T Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int times = (2 * T + 1) / (2 * A); times (2 * T + 1) / (2 * A) (2 * T + 1) 2 * T 2 T 1 (2 * A) 2 A int num = B * times; num B * times B times out.printf("%d\n", num) out.printf out "%d\n" num out.flush() out.flush out String[] args args
import java.util.*;
import java.io.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);

        int A = Integer.parseInt(sc.next());
        int B = Integer.parseInt(sc.next());
        int T = Integer.parseInt(sc.next());

        int times = (2 * T + 1) / (2 * A);
        int num = B * times;
        out.printf("%d\n", num);
        out.flush();
    }
}
