import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		long a = sc.nextLong();
		long b = sc.nextLong();
		long c = sc.nextLong();
		long money = (a - 1) + b;
		long count = c / money;
		long mod = c % money;
		if (mod >= a) {
		    count++;
		    mod = 0;
		}
		long ans = count * a + mod;
	    System.out.println(ans);
	}
}