#include<stdio.h>
#include<math.h>


int a[1000010];


int main()
{
	freopen("mins.in","r",stdin);
	freopen("mins.out","w",stdout);
	int n,m,min,nr=0,lim,j,i;
	scanf("%d%d",&n,&m);
	if(n>m)
	{
		min=n;
		n=m;
		m=min;
	}
	lim=m/2;
	for(i=1;i<=m;++i)
		a[i]=i;
	for(i=2;i<=lim;++i)
		if(a[i]==i)
			for(j=i;j<=m;j=j+i)
				a[j]=a[j]/i*(i-1);
	for(i=lim+1;i<=m;++i)
		if(a[i]==i)
			--a[i];
	--n;
	--m;
	for(i=1;i<=n;++i)
		nr=nr+a[i]*2;
	for(i=n+1;i<=m;++i)
		nr=nr+a[i]-a[i-n];
	printf("%d\n",nr);
	return 0;
}