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#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
using namespace std;
#define VAR(n,v) typeof(v) n=(v)
#define REP(i,n) for(int i=1; i<=(n); ++i)
#define FOR(i,a,b) for(VAR(i,a); i!=(b); ++i)
#define FORE(it,t) FOR(it,t.begin(),t.end())
typedef vector<int> vi;
#define pb push_back
typedef pair<int,int> pii;
#define mp make_pair
#define st first
#define nd second
typedef long long ll;
#define INF 1000000001
#define sz size()
#define ALL(t) (t).begin(),(t).end()
#define SC(a) scanf("%d", &a)
#define GET(a) int a; SC(a)
#define ISDEBUG 0
#define dprintf(...) if(ISDEBUG) \
	{printf("\033[31m"); printf(__VA_ARGS__); printf("\033[0m");}
template <class It> void dptab(It b, It e, const char* f="%d ")
	{if(ISDEBUG) {for(It it=b; it!=e; ++it) dprintf(f, *it); dprintf("\n"); }}

int main() {
	GET(n); GET(m);
	vi p(m);
	int s=0;
	REP(i,n) {GET(a); s+=a;}
	FOR(i,0,m) SC(p[i]);
	sort(ALL(p));
	reverse(ALL(p));
	dprintf("%d\n", s);
	int c=0;
	FOR(i,0,m) {
		c+=p[i];
		if(c>=s) {
			dprintf("%d\n", c);
			printf("%d\n", i+1);
			return 0;
		}
	}
}