/******************************************************************************

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#include <bits/stdc++.h>

using namespace std;
ifstream fin("mins.in");
ofstream fout("mins.out");
int n,m;
const int nmax=1000005;
int cnt[nmax];

int main()
{
    fin>>n>>m;
    n--; m--;
    long long nr=0;
    for (int i=2; i<=min(n,m); ++i)
    {
        int x=cnt[i]-1;
        nr-=1LL*x*n/i*m/i;
        for (int j=i; j<=min(n,m); j+=i)
        {
            cnt[j]-=x;
        }
    }
    fout<<1LL*n*m-nr;

    return 0;
}