#include <bits/stdc++.h>
using namespace std;
ifstream f("mins.in");
ofstream g("mins.out");
const int NrMax = 1000005;
long long n, m, nr[NrMax], x, cnt;
int main()
{
    f >> n >> m;
    n --; m --;
    for(int i = 2; i <= min(n, m); i ++)
    {
        x = nr[i] - 1;
        cnt -= 1LL * x * (n / i) * (m / i);
        for(int j = i; j <= min(n, m); j += i)
            nr[j] -= x;
    }

    g << 1LL * n * m - cnt;
    return 0;
}