#include <bits/stdc++.h>

using namespace std;

ifstream fin("mins.in");
ofstream fout("mins.out");
const long long Max = 1000000;
long long c, d, n, i, j, r;
long long mul[Max + 2];

int main() {
    fin >> c >> d;
    c--;
    d--;

    n = min(c, d);

    for(i = 2; i <= n; i++) {
        if(mul[i] == 1) continue;

        long long semn;
        if(mul[i] == 0) semn = 1;
        else            semn = -1;

        r += semn * (c / i) * (d / i);
        for(j = 2 * i; j <= n; j += i) mul[j] += semn;
    }
    fout << c * d - r;

    return 0;
}