from math import isqrt

mod = 998244353
n,m = map(int, input().split())

k = isqrt(m)
ans = 0
for i in range(1, k+1):
    ans += (m % i)
    ans %= mod

for d in range(0, m//k+1):
    r = n+1 if d == 0 else min(m // d + 1, n+1)
    l = max(m // (d+1) + 1, k+1)
    if r <= l: continue
    ans += m * (r-l) - (r-l) * (l+r-1) // 2 * d
    ans %= mod
print(ans)