import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		StringBuilder sb = new StringBuilder();
		long x = sc.nextLong();
		long y = sc.nextLong();
		long z = sc.nextLong();
		long ans = z;
		if (z >= y) {
			ans--;
		}
		if (z >= x) {
			ans--;
		}
		System.out.println(ans);
	}
}