import sys
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


n,m = MI()
mod = 998244353

N = int(n**.5)
ans = 0
for i in range(1,min(N,m)+1):
    x = n//i
    ans += i*x*(x+3)//2
    ans %= mod

for x in range(N,0,-1):
    left = max(n//(x+1),min(N,m))+1
    right = min(m,n//x)
    if left > right:
        continue
    ans += x*(x+3)//2*(left+right)*(right-left+1)//2
    ans %= mod

print(ans)