#include<bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    ll a,b,a1,b1;
    cin >> a >> b >> a1 >> b1;
    if(a1 != 0 && b1!= 0){
        cout << a + b << endl;
    }else{
        if(a1 == 0) cout << b + 2 << endl;
        else if(b1 == 0) cout << a + 2 << endl;
    }
    return 0;
}