#include <fstream>
#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;

const int VMAX = 1e6;

int nrdp[1+VMAX], x, y;
long long rez;
int prime[VMAX], np;

void calcul_nrdp(int n)
{
    for (int i = 2; i <= n; i++)
    {
        if (nrdp[i] == 0)
        {
            prime[np++] = i;
            for (int multiplu = i; multiplu <= n; multiplu += i)
            {
                nrdp[multiplu]++;
            }
        }
    }
    for (int i = 0; i < np && (long long)prime[i] * prime[i] <= n; i++)
    {
        int patrat = prime[i] * prime[i];
        for (int multiplu = patrat; multiplu <= n; multiplu += patrat)
        {
            nrdp[multiplu] = -1;
        }
    }
}

int main()
{
    ifstream in("mins.in");
    ofstream out("mins.out");
    in >> x >> y;
    int n = min(x-1, y-1);
    calcul_nrdp(n);
    rez = (long long)(x- 1) * (y - 1);
    for (int i = 2; i <= n; i++)
    {
        if (nrdp[i] != -1)
        {
            long long nr_fractii_red = ((long long)(x - 1) / i) * ((long long)(y - 1) / i);
            if (nrdp[i] % 2 == 0)
            {
                rez += nr_fractii_red;
            }
            else
            {
                rez -= nr_fractii_red;
            }
        }
    }
    out << rez;
    in.close();
    out.close();
    return 0;
}