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 ans;
    	if (y <= z) {
    	    ans = z - 2;
    	} else if (x <= z) {
    	    ans = z - 1;
    	} else {
    	    ans = z;
    	}
    	System.out.println(ans);
    }
}