package algo;

import java.util.Scanner;

//import algo.*;

public class sample7 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long Y = sc.nextLong();
		long Z = sc.nextLong();
		long cnt = Z;
		
		if(Z >= X) {
			cnt -= 1;
			}
		if(Z >= Y) {
			cnt -= 1;
		}
		System.out.println(cnt);
	}
}