#include <fstream>

using namespace std;

const int Nmax = 1000005;

int ciur[Nmax];

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

    int n, m, x;
    long long sol;

    fin >> n >> m;
    n--; m--;

    sol = 0;
    for(int i = 2; i <= min(n, m); i++){
        x = ciur[i] - 1;

        if(x == 0){
            continue;
        }

        sol -= 1LL * x * (n / i) * (m / i);
        for(int j = i; j <= min(n, m); j++){
            ciur[i] -= x;
        }
    }

    fout << 1LL * n * m - sol;

    return 0;
}