from math import isqrt
n,m = map(int,input().split())
l = isqrt(m); x = n*m
for i in range(1,min(l,n)+1): x -= m//i*i
if l<n:
    for i in range(1,m//l+1): x -= (l+1+min(m//i,n))*(min(m//i,n)-l)//2
print(x%998244353)