import sys
input = sys.stdin.readline
n,m=map(int,input().split())
mod=998244353
ans=0
if m<n:
  ans+=(n-m)*m
  ans%=mod
for i in range(1,10**6+1):
  mi=m//(i+1)+1
  if mi>n:
    continue
  ma=m//i
  ma=min(ma,n)
  if mi>ma:
    continue
  amari=m%ma
  tot=(amari+amari+i*(ma-mi))*(ma-mi+1)
  tot//=2
  ans+=tot
  ans%=mod
mi=m//(10**6+1)+1
for i in range(1,min(n+1,mi)):
  ans+=m%i
  ans%=mod
print(ans)