#時間キツい
import math
ans=0
M=998244353
x,y=map(int,input().split())
n=min(x,y)
P=[0]+[-1]*n

for i in range(2,n+1):
    if P[i]==-1:
        for j in range(i,n+1,i):
            P[j]=i
            
A=[0]+[1]
for i in range(2,n+1):
    if i%(P[i]**2)==0:
        A.append(A[i//P[i]])
    else:
        A.append(A[i//P[i]]*(1-P[i]))

ans=0
for i in range(1,n+1):
    xx=x//i
    yy=y//i
    ans+=xx*yy*(xx+1)*(yy+1)*i*A[i]
    ans%=M
print((ans*pow(4,-1,M))%M)