#include<stdio.h>

int main(void){
	int aw,ab,bw,bb,c,d;
	scanf("%d%d%d%d%d%d",&aw,&ab,&bw,&bb,&c,&d);
	if(ab >= c){ab-=c;bb+=c;}else{bb+=ab;bw+=(c-ab);aw-=(c-ab);ab = 0;}
	if(bw >= d){bw-=d;aw+=d;}else{aw+=bw;}
	printf("%d\n",aw);
	return 0;
}