ac

#include<cstdio>
int main()
{
int n,m;
scanf("%d%d",&n,&m);
if(n>m)
{
int x=n;
n=m;
m=x;
}
int cnt=0;
for(int i=1;i<=n;++i)
{
cnt+=(n-i+1)*(m-i+1);
}
printf("%d",cnt);
}