#include <iostream>
#include <algorithm>
 
using namespace std;
 
int main() {
	int a, b, c, d; 
 
	cin >> a >> b >> c >> d;
 
	int res = a + b + c + d - min({a, b, c, d}) + 1;
 
	cout << res << "\n";
 
	return 0;
}
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