#include <fstream>

using namespace std;
ifstream f("mins.in");
ofstream g("mins.out");
int n,m,k,a[1000005],b[1000005];
long long sol;
void afisare()
{
    g<<sol<<'\n';
}
void citire()
{
    f>>n>>m;
    --n;
    --m;
    k=min(n,m);
}
void rezolva()
{
    int i,j;
    sol=1LL*n*m;
    for(i=2;i<=k;i++)
    {
        if(!a[i])
        {
            for(j=i;j<=n;j+=i)
            {
                ++a[j];
            }
            if(1LL*i*i<=1LL*n)
            {
                for(j=i*i;j<=n;j+=i*i)
                {
                    b[j]=1;
                }
            }
        }
        if(!b[i])
        {
            if(a[i]%2)sol-=1LL*(1LL*n/i)*(1LL*m/i);
            else sol+=1LL*(1LL*n/i)*(1LL*m/i);
        }
    }
    afisare();
}
int main()
{
    citire();
    rezolva();
    return 0;
}