#include <iostream>
using namespace std;
int main(){
    int a,b,c,d,e,f;cin>>a>>b>>c>>d>>e>>f;
    if(b < e){
        d += b;
        c += (e-b);
        a -= (e-b);
        b = 0;
    }else{
        d += e;
        b -= e;
    }
    if(c < f){
        cout << a+c << endl;
    }else{
        cout << a+f << endl;
    }
    
}