from typing import List, Tuple def floorRange(n: int) -> List[Tuple[int, int, int]]: """ 将 [1,n] 内的数分成O(2*sqrt(n))段, 每段内的 n//i 相同 Args: n (int): n>=1 Returns: List[Tuple[int,int,int]]: 每个元素为(left,right,div) 表示 left <= i <= right 内的 n//i == div """ res = [] m = 1 while m * m <= n: res.append((m, m, n // m)) m += 1 for i in range(m, 0, -1): left = n // (i + 1) + 1 right = n // i if left <= right and res and res[-1][1] < left: res.append((left, right, n // left)) return res if __name__ == "__main__": # n = int(input()) # print(floorRange(n)) # [(1, 2, 9), (2, 3, 4), (3, 4, 3), (5, 10, 1)] # https://yukicoder.me/problems/no/1573 MOD = 998244353 n, m = map(int, input().split()) res = 0 for left, right, div in floorRange(n): right += 1 higher = min(right - 1, m) if lower > higher: break x = div * (div + 1) // 2 + div y = (lower + higher) * (higher - lower + 1) // 2 res += x * y res %= MOD print(res)