#include<bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;
using ll=long long;
#define LNF 0x3f3f3f3f3f3f3f3f
#define INF 0x3f3f3f3f
template <class T> using Tree = tree<T, null_type, less<T>,rb_tree_tag, tree_order_statistics_node_update>;
#define pll pair<int,int>
void solve(void){
    ll x,y;
    cin>>x>>y;
    ll ans=0;
    while(x!=3){
        if(x==2||y==2){
            ans+=2;
        }else ans++;
        x++;
    }
    cout<<ans;
}
int main() {
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    int t=1;
    // cin>>t;
    while(t--)
    solve();
    return 0;
}