import java.util.Scanner;

public class Main{
 public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  long a1 = sc.nextInt();
  long a2 = sc.nextInt();
  long a3 = sc.nextInt();
   int count =0;
   if(((a2>a1)&&(a2>a3))||((a2<a1)&&(a1<a3))){
   int p=1;
   for(int i=0;i<a2;i++){
    long b1=a1%p;
    long b2=a2%p;
    long b3=a3%p;
    if(((b2>b1)&&(b2>b3))||((b2<b1)&&(b1<b3))){
     count++;
    }
    p++;
   }
  }  
  System.out.println(count);
 }
}