from math import isqrt

N, M = map(int, input().split())
ans = N * M
dif = 0
# dif = sum(k * (M // k) for k in range(1, N + 1))
s = min(N, isqrt(M))
for i in range(1, s + 1):
	dif += i * (M // i)
for i in range(s + 1):
	# M // k = i となる k の範囲
	le = M // (i + 1)
	ri = M // i if i > 0 else 10 ** 15
	le = max(le, s)
	ri = min(ri, N)
	dif += (ri * (ri + 1) // 2 - le * (le + 1) // 2) * i
print((ans - dif) % 998244353)