#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];
        if (nrc>1)
        {
            sol-=(nrc-1)*(n/i)*(m/i);
            for (j=i+i; j<=minim; j+=i)
                val[j]-=nrc-1;
        }
        else
        {
            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;
}