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


public class Main_yukicoder604 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		long a = sc.nextLong();
		long b = sc.nextLong();
		long c = sc.nextLong();

		if (c <= a) {
			pr.println(c);
		} else {
			long tmp = a - 1 + b;

			pr.println(c / tmp * a + c - c / tmp * tmp);
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}