package m.shin;
import java.util.Scanner;
public class Con857 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		long X = s.nextLong() , Y = s.nextLong() , Z = s.nextLong();
		s.close();

		if(Y <= Z){
			Z--;
		}
		if(X <= Z){
			Z--;
		}
		System.out.println(Z);

	}

}