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();
		if(z>=y)System.out.println(z-2);
		else if(y>=z&&z>=x)System.out.println(z-1);
		else if(x>z)System.out.println(z);
	}
}