import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.NoSuchElementException;

public class Main {

	static final int mod = 1000000007;
	static long[] fac;
	static long[] inv;
	static long[] finv;
	

	public static void main(String[] args) {

		FastScanner sc = new FastScanner();
		PrintWriter out=new PrintWriter(System.out);
		int L = sc.nextInt();
		int R = sc.nextInt();
		
		if(L+2019<R) {
			R=L+2019;
		}
		int ans=10000;
		for(int i=L;i<=R-1;i++) {
			for(int j=i+1;j<=R;j++) {
				int mod=((i%2019)*(j%2019))%2019;
				if(ans>mod) {
					ans=mod;
				}
			}
		}
		out.println(ans);
		out.flush();
	}
	
	static void calcNumOfCombinationInit(int N) {
		
		fac=new long[N];
		inv=new long[N];
		finv=new long[N];
		fac[0]=1;
		fac[1]=1;
		finv[0]=1;
		finv[1]=1;
		inv[1]=1;
		for(int i=2;i<N;i++) {
			fac[i]=fac[i-1]*i%mod;
			inv[i]=mod-inv[mod%i]*(mod/i)%mod;
			finv[i]=finv[i-1]*inv[i]%mod;
		}
		
	}

	static long calcNumOfCombination(int n, int r) {
		if(n<r || n<0 || r<0) {
			return 0;
		}
		return fac[n]*(finv[r]*finv[n-r]%mod)%mod;
	}

}

class FastScanner {
	private final InputStream in = System.in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	public boolean hasNext() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
			throw new NumberFormatException();
		return (int) nl;
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}

	public char[][] nextCharsHW(int H, int W) {
		char[][] chars = new char[H][W];
		for (int i = 0; i < H; i++) {
			String str = next();
			for (int j = 0; j < W; j++) {
				chars[i][j] = str.charAt(j);
			}
		}
		return chars;
	}

	public int[][] nextIntsNM(int N, int M) {
		int[][] ints = new int[N][M];
		for (int i = 0; i < N; i++) {
			for (int j = 0; j < M; j++) {
				ints[i][j] = nextInt();
			}
		}
		return ints;
	}
}


Measured memory_bytes: 23380