#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int n, m;
    long long cnt = 0;
    fin>>n>>m;
    n--, m--;

    for (short i = 2; i <= min(n, m); i++) {
        cnt += 1ll*(n/i)*(m/i);

        for (short j = 2*i; j <= min(n, m); j += i) cnt -= 1ll*(n/j)*(m/j);
    }

    fout<<1ll*n*m-cnt;
    return 0;
}