import java.util.*;
public class Main {
	public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	}
} Main public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	} main {
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long l = sc.nextLong(); l sc.nextLong() sc.nextLong sc long r = sc.nextLong(); r sc.nextLong() sc.nextLong sc if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      } r-l > 3000 r-l r l 3000 {
        System.out.println(0);
      } System.out.println(0) System.out.println System.out System System.out 0 {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      } long min = 2018; min 2018 for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        } long i = l; long i = l; i l i < r i r i++ i++ i {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        } {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        } for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          } long j = l+1; long j = l+1; j l+1 l 1 j <=r j r j++ j++ j {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          } {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          } long num = (i*j)%2019; num (i*j)%2019 (i*j) i j 2019 if(num<min) {
              min = num;
            } num<min num min {
              min = num;
            } min = num min num System.out.println(min) System.out.println System.out System System.out min String[] args args public class Main {
	public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	}
} public class Main {
	public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	}
} Main
import java.util.*;
public class Main {
	public static void main(String[] args){
	  Scanner sc = new Scanner(System.in);
	  long l = sc.nextLong();
	  long r = sc.nextLong();
      
      
      if(r-l > 3000) {
        System.out.println(0);
      }else {
      
        long min = 2018;
        for(long i = l; i < r; i++) {
          for(long j = l+1; j <=r; j++) {
            long num = (i*j)%2019;
            if(num<min) {
              min = num;
            }
          }
        }
                  System.out.println(min);

  
      }

      
	}
}