#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    ll a, b, o, w;
    cin >> a >> b >> o >> w;

    ll ans = 0;

    cout << o + max(a, b) + w << endl;

    return 0;
}