import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		long X = sc.nextLong();
		long Y = sc.nextLong();
		long Z = sc.nextLong();

		long day = X <= Z ? Z-1 : Z;
		day = Y <= Z ? day-1 : day;
		println(day);
	}

	public static void print(Object o) {
		System.out.print(o);
	}

	public static void println(Object o) {
		System.out.println(o);
	}
}