// #pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
// #include <x86intrin.h>
using namespace std;
#if __cplusplus >= 202002L
using namespace numbers;
#endif



int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(ios::badbit | ios::failbit);
	int a, b, o, ab;
	cin >> a >> b >> o >> ab;
	cout << o + max(a, b) + ab << "\n";
	return 0;
}

/*

*/