#include <stdio.h>

int main() {
  int Aw, Ab, Bw, Bb, C, D;
  scanf("%d %d %d %d %d %d", &Aw, &Ab, &Bw, &Bb, &C, &D);

  if (Ab>=C) {
    Bb+=C;
  } else {
    Bb+=Ab;
    Bw+=C-Ab;
    Aw-=C-Ab;
  }

  if (D>=Bw) {
    Aw+=Bw;
  } else {
    Aw+=D;
  }

  printf("%d\n", Aw);
  return 0;
}