import sys

sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
# inf = -1-(-1 << 31)
inf = -1-(-1 << 62)

# md = 10**9+7
md = 998244353

# a%b=a-a//b*b

i2 = (md+1)//2
i12 = pow(12, md-2, md)
n, m = LI()

def sig(f, r):
    return -i12*f%md*(r-1)%md*r%md*(f*(2*r-1)%md-6*n+2*r-7)%md

ans = m*n*(n+1)*i2%md
l = 1
while l <= m:
    f = n//l
    if f == 0: break
    r = min(n//f+1, m+1)
    ans -= sig(f, r)-sig(f, l)
    ans %= md
    l = r

print(ans)