#include<stdio.h>

int v[1000002];

long long min(long long a,long long b)
{
    return a<b?a:b;
}

int main()
{
    freopen("mins.in","r",stdin);
    freopen("mins.out","w",stdout);
    long long n,m,i,j,s=0,max,p;
    scanf("%lld%lld",&n,&m);
    max=min(n,m)-1;
    for(i=2;i<=max;++i)
    {
        if(v[i]==0)
        {
            for(j=i;j<=max;j+=i)
                ++v[j];
            p=i*i;
            for(j=p;j<=max;j+=p)
                v[j]=-2000000000;
        }
        else if(v[i]>0)
        if(v[i]&1)
            s-=((n-1)/i)*((m-1)/i);
        else
            s+=((n-1)/i)*((m-1)/i);
    }

    printf("%lld\n",s+(n-1)*(m-1));
    return 0;
}