import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	}

} Main public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	} main {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	} Scanner scan= new Scanner(System.in); scan new Scanner(System.in) int a=scan.nextInt(); a scan.nextInt() scan.nextInt scan int b=scan.nextInt(); b scan.nextInt() scan.nextInt scan int t=scan.nextInt(); t scan.nextInt() scan.nextInt scan double e=(t+0.5); e (t+0.5) t 0.5 int c=0 c 0 d=0; d 0 while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		} true {
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		} d+=a d a c+=b c b if(d>e)
			{
				System.out.println(c-b);
				break;
			} d>e d e {
				System.out.println(c-b);
				break;
			} System.out.println(c-b) System.out.println System.out System System.out c-b c b break; String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	}

} public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int t=scan.nextInt();
		double e=(t+0.5);
		int c=0,d=0;
		while(true)
		{
			d+=a;
			c+=b;
			if(d>e)
			{
				System.out.println(c-b);
				break;
			}
			
		}
		
	}

}
