#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("mins.in");
ofstream fout("mins.out");

const int Nmax = 1000005;

int n, m;
int cnt[Nmax];
long long nr;

int main()
{
    fin >> n >> m;
    n--;
    m--;
    for(int i = 2; i <= min(n,m); i++)
    {
        int x = cnt[i]-1;
        nr -= (1LL * x * (n/i) * (m/i));
        for(int j = i; j < min(n,m); j += i)
            cnt[j] -= x;
    }
    fout << 1LL*n*m-nr;
    return 0;
}