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 T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  }
} import java.util.Scanner; Scanner java.util public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  } main {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc int B = sc.nextInt(); B sc.nextInt() sc.nextInt sc int T = sc.nextInt(); T sc.nextInt() sc.nextInt sc int now = 0; now 0 int bis = 0; bis 0 while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    } true {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    } if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	} now > T+0.5 now T+0.5 T 0.5 {
    		bis -= B;
        	now -= A;
    		break;
    	} bis -= B bis B now -= A now A break; bis += B bis B now += A now A System.out.println(bis) System.out.println System.out System System.out bis String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  }
} Main
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 T = sc.nextInt();

    int now = 0;
    int bis = 0;
    while (true) {
    	if (now > T+0.5) {
    		bis -= B;
        	now -= A;
    		break;
    	}
    	bis += B;
    	now += A;
    }
    System.out.println(bis);
  }
}