#include "stdio.h"
#include "math.h"
int main()
{
	long n,e,l1,l2,i,all,tint;
	double tmp;
	long temp;
	scanf("%ld%ld",&n,&e);
	for(i=1,l1=0;i<n;i++){ scanf("%ld",&temp);l1+=temp;}
	for(i=1,l2=0;i<e;i++){ scanf("%ld",&temp);l2+=temp;}
	all=l1*l1+l2*l2;
	tint=sqrt(all);
	if(all==tint*tint) printf("%ld\n",tint);
	else printf("%ld\n",tint+1);
	return 0;
}