import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
	public static void main(String[] args){
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	}
 
}
 
class FastScanner {
    private BufferedReader reader = null;
    private StringTokenizer tokenizer = null;
 
    public FastScanner(InputStream in) {
        reader = new BufferedReader(new InputStreamReader(in));
        tokenizer = null;
    }
 
    public String next() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }
 
    public String nextLine() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
 
        return tokenizer.nextToken("\n");
    }
 
    public long nextLong() {
        return Long.parseLong(next());
    }
 
    public int nextInt() {
        return Integer.parseInt(next());
    }
 
    public double nextDouble() {
         return Double.parseDouble(next());
     }
 
    public int[] nextIntArray(int n) {
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = nextInt();
        return a;
    }
 
    public long[] nextLongArray(int n) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = nextLong();
        return a;
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
	public static void main(String[] args){
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	}
 
} Main public static void main(String[] args){
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	} main {
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	} FastScanner sc = new FastScanner(System.in); sc new FastScanner(System.in) long n = sc.nextLong(); n sc.nextLong() sc.nextLong sc long m = sc.nextLong(); m sc.nextLong() sc.nextLong sc long out = 0; out 0 long min = 2020; min 2020 if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		} m-n < 2018 m-n m n 2018 {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		} for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			} long i=n; long i=n; i n i<m i m i++ i++ i {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			} {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			} for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				} long j=i+1; long j=i+1; j i+1 i 1 j<=m j m j++ j++ j {
					min = Math.min(min, (i*j)%2019);
				} {
					min = Math.min(min, (i*j)%2019);
				} min = Math.min(min, (i*j)%2019) min Math.min(min, (i*j)%2019) Math.min Math min (i*j)%2019 (i*j) i j 2019 out = min out min System.out.println(out) System.out.println System.out System System.out out String[] args args class FastScanner {
    private BufferedReader reader = null;
    private StringTokenizer tokenizer = null;
 
    public FastScanner(InputStream in) {
        reader = new BufferedReader(new InputStreamReader(in));
        tokenizer = null;
    }
 
    public String next() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }
 
    public String nextLine() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
 
        return tokenizer.nextToken("\n");
    }
 
    public long nextLong() {
        return Long.parseLong(next());
    }
 
    public int nextInt() {
        return Integer.parseInt(next());
    }
 
    public double nextDouble() {
         return Double.parseDouble(next());
     }
 
    public int[] nextIntArray(int n) {
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = nextInt();
        return a;
    }
 
    public long[] nextLongArray(int n) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = nextLong();
        return a;
    }
} FastScanner private BufferedReader reader = null; reader null private StringTokenizer tokenizer = null; tokenizer null public FastScanner(InputStream in) {
        reader = new BufferedReader(new InputStreamReader(in));
        tokenizer = null;
    } FastScanner {
        reader = new BufferedReader(new InputStreamReader(in));
        tokenizer = null;
    } reader = new BufferedReader(new InputStreamReader(in)) reader new BufferedReader(new InputStreamReader(in)) tokenizer = null tokenizer null InputStream in in public String next() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    } next {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    } if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        } try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            } catch (IOException e) {
                throw new RuntimeException(e);
            } IOException e {
                throw new RuntimeException(e);
            } throw new RuntimeException(e); new RuntimeException(e) {
                tokenizer = new StringTokenizer(reader.readLine());
            } tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public String nextLine() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
 
        return tokenizer.nextToken("\n");
    } nextLine {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
 
        return tokenizer.nextToken("\n");
    } if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        } try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            } catch (IOException e) {
                throw new RuntimeException(e);
            } IOException e {
                throw new RuntimeException(e);
            } throw new RuntimeException(e); new RuntimeException(e) {
                return reader.readLine();
            } return reader.readLine(); reader.readLine() reader.readLine reader return tokenizer.nextToken("\n"); tokenizer.nextToken("\n") tokenizer.nextToken tokenizer "\n" public long nextLong() {
        return Long.parseLong(next());
    } nextLong {
        return Long.parseLong(next());
    } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next public int nextInt() {
        return Integer.parseInt(next());
    } nextInt {
        return Integer.parseInt(next());
    } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public double nextDouble() {
         return Double.parseDouble(next());
     } nextDouble {
         return Double.parseDouble(next());
     } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next public int[] nextIntArray(int n) {
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = nextInt();
        return a;
    } nextIntArray {
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = nextInt();
        return a;
    } int[] a = new int[n]; a new int[n] n for (int i = 0; i < n; i++)
            a[i] = nextInt(); int i = 0; int i = 0; i 0 i < n i n i++ i++ i a[i] = nextInt(); a[i] = nextInt() a[i] a i nextInt() nextInt return a; a int n n public long[] nextLongArray(int n) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = nextLong();
        return a;
    } nextLongArray {
        long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = nextLong();
        return a;
    } long[] a = new long[n]; a new long[n] n for (int i = 0; i < n; i++)
            a[i] = nextLong(); int i = 0; int i = 0; i 0 i < n i n i++ i++ i a[i] = nextLong(); a[i] = nextLong() a[i] a i nextLong() nextLong return a; a int n n public class Main {
	public static void main(String[] args){
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	}
 
} public class Main {
	public static void main(String[] args){
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	}
 
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
	public static void main(String[] args){
		FastScanner sc = new FastScanner(System.in);
		long n = sc.nextLong();
		long m = sc.nextLong();
		long out = 0;
		long min = 2020;
		if (m-n < 2018) {
 
			for (long i=n;i<m;i++) {
 
				for (long j=i+1;j<=m;j++) {
					min = Math.min(min, (i*j)%2019);
				}
 
			}
			out = min;
 
		}
		System.out.println(out);
 
	}
 
}
 
class FastScanner {
    private BufferedReader reader = null;
    private StringTokenizer tokenizer = null;
 
    public FastScanner(InputStream in) {
        reader = new BufferedReader(new InputStreamReader(in));
        tokenizer = null;
    }
 
    public String next() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }
 
    public String nextLine() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
 
        return tokenizer.nextToken("\n");
    }
 
    public long nextLong() {
        return Long.parseLong(next());
    }
 
    public int nextInt() {
        return Integer.parseInt(next());
    }
 
    public double nextDouble() {
         return Double.parseDouble(next());
     }
 
    public int[] nextIntArray(int n) {
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = nextInt();
        return a;
    }
 
    public long[] nextLongArray(int n) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = nextLong();
        return a;
    }
}