#include <fstream>
#include <vector>
using namespace std;
ifstream cin("mins.in");
ofstream cout("mins.out");
using ll = long long;
using pii = pair<int,int>;
const int nmax = 1e6 + 1;
ll n , m , siv[nmax];
signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cin >> n >> m;
    int mx = max(n,m);
    for(int i = mx ; i >= 1 ; --i)
    {
        siv[i] = (n/i)*(m/i);
        for(int j = i+i ; j <= mx ; j += i)
        {
            siv[i] -= siv[j];
        }
    }
    cout << siv[1]/2 + 1;
    return 0;
}