Problem:
Score : 300 points

Problem Statement

You are given two non-negative integers L and R.
We will choose two integers i and j such that L \leq i < j \leq R.
Find the minimum possible value of (i \times j) \mbox{ mod } 2019.

Constraints

All values in input are integers.

0 \leq L < R \leq 2 \times 10^9

Input

Input is given from Standard Input in the following format:

L R

Output

Print the minimum possible value of (i \times j) \mbox{ mod } 2019 when i and j are chosen under the given condition.

Sample Input 1

2020 2040

Sample Output 1

2

When (i, j) = (2020, 2021), (i \times j) \mbox{ mod } 2019 = 2.

Sample Input 2

4 5

Sample Output 2

20

We have only one choice: (i, j) = (4, 5).

Solution in PyPy3 (2.4.0) (judge verdict: Runtime Error)

def main():
    L, R = list(map(int, input().split()))
    ans = 2018
    end = min(R+1, L+2019))
    for i in range(L, end-1):
        for j in range(i+1, end):
            print(ans, (i*j)%2019)
            ans = min(ans, (i*j)%2019)
    print(ans)

main()