#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,e,f,sum;
int main(){
	cin>>a>>b>>c>>d>>e>>f;
	sum+=a+b+c+d+e+f;
	sum-=min(a,min(b,min(c,d)));
	sum-=min(e,f);
	cout<<sum;
    return 0;
}