#include <fstream>
#include <vector>
#include <bitset>
#define int long long
using namespace std;
ifstream in("mins.in");
ofstream out("mins.out");
int mask, j, k, i, n, m, s, lg, best;
int v1[] = {-1, 1};
void fact(int x);
vector<int32_t> ciur[1000010];
int32_t main()
{
    in >> n >> m;
    i = 2;
    n--;
    m--;
    if (n > m)
        swap(n, m);
    ciur[i].push_back(i);
    for (j = i*2; j <= n; j+=i)
        ciur[j].push_back(i);
    for (i = 3; i <= n; i += 2)
        if (ciur[i].size() == 0)
        {
            ciur[i].push_back(i);
            for (j = i*2; j <= n; j+=i)
            {
                ciur[j].push_back(i);
            }
        }
    for (i = 1; i <= n; i++)
    {
        s=0;
        lg=ciur[i].size();
        for (mask = 1; mask < (1<<lg); mask++)
        {
            int nr = 0, p = 1;
            for (j = 0; j < lg; j++)
                if ((mask&(1<<(j))))
                {
                    nr++;
                    p*=1ll*ciur[i][j];
                }
            s += m/p*v1[nr%2];
        }
        best += m-s;
    }
    out << best;
    return 0;
}