#include<stdio.h>
int main()
{

  int a,aw,ab;
  int b,bw,bb;
  int c,d;
  int tmp;

  scanf("%d %d %d %d %d %d",&aw,&ab,&bw,&bb,&c,&d);
  a = aw+ab;
  b = bw+bb;

  if(ab > c ){
    a -= c;
    ab -= c;
    bb += c;
    b += c;
    //Bの中から白を最初に取っていく
    if(bw>d){
      //b -= d;
      //bw -= d;
      //a += d;
      aw += d;
    }
    else{
      aw += bw;
    }
  }
  else{
    tmp = c - ab;
    ab = 0;
    aw -= tmp;
    a -= c;
    b += c;
    bw += tmp;
    bb += ab;
    if(bw>d){
      aw += d;
    }
    else{
      aw += bw;
    }
  }
  printf("%d\n",aw);
  return 0;
}