#include<iostream>
using namespace std;
int A[3],B;
int main()
{
	cin>>A[0]>>A[1]>>A[2]>>B;
	int ans=A[0]+A[1]+A[2]+B;
	ans=max(ans,max(A[0],max(A[1],A[2]))*3);
	cout<<ans<<endl;
}