#include <fstream>
using namespace std;
ifstream fin ("mins.in");
ofstream fout ("mins.out");
long long i,nrc,j,n,m,minim,sol,val[1000001];
int main ()
{
    fin>>n>>m;
    n--;
    m--;
    minim=min (n,m);
    for (i=2; i<=minim; i++)
    {
        nrc=val[i];
        sol-=(nrc-1)*(n/i)*(m/i);
        for (j=i+i; j<=minim; j+=i)
            val[j]-=nrc-1;
    }
    fout<<n*m-sol;
    return 0;
}