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 times = c / (a - 1 + b);
    	long mod = c % (a - 1 + b);
    	long ans;
    	if (mod < a) {
    	    ans = times * a + mod;
    	} else {
    	    ans = (times + 1) * a;
    	}
    	System.out.println(ans);
	}
}