#include <bits/stdc++.h>
#define ll long long 
using namespace std;

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

long long c, d;

void Citire()
{
    fin >> c >> d;
    c--;
    d--;
}

ll sol;
ll cnt[1000008];

void Rezolvare()
{
    ll i, j;

    ll n = min( c, d );
    for( i=2; i<=n; i++ )
    {
        if( cnt[i] == 1 )
            continue;

        ll k = 1 - cnt[i];
        sol += k * c/i * d/i;
        for( j=i + i; j<=n; j+=i )
            cnt[j]+=k;
    }
    fout << (c * d)  - sol;
}

int main()
{
    Citire();
    Rezolvare();
}