import java.util.Scanner;

public class No604 {
	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 k,K,sum;
		for(k = 0;(A+B-1) * k < C;k++) {
		}
		k -= 1;
		sum = (A+B-1) * k;
		if(C - sum < A - 1) {
			K = C - sum;
		}else {
			K = A;
		}
		System.out.println(k * A + K);
	}
}