#include <iostream>
using namespace std;
int main()
{
    int a,b;
    cin>>a>>b;
    int x[5],y[5],sum1[5],sum2[5];
    sum1[0]=0,sum2[0]=0;
    x[1]=6;
    x[2]=3;
    x[3]=1;
    x[4]=4;
    y[1]=6;
    y[2]=2;
    y[3]=1;
    y[4]=5;
    for(int i=1;i<=4;i++)
    {
        sum1[i]=sum1[i-1]+x[i];
        sum2[i]=sum2[i-1]+y[i];
    }
    if(b==1)
    {
        int t=a/4;
        int u=a%4;
        int p=(6+3+1+4)*t+sum1[u];
        cout<<p;
    }
    else if(a==1)
    {
        int t=b/4;
        int u=b%4;
        int p=(6+2+1+5)*t+sum2[u];
        cout<<p;
    }
    else
    {
        cout<<a*b*6;
    }
    return 0;
}