#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
template<class T> inline void walloc1d(T **arr, int x, void **mem = &wmem){
static int skip[16] = {0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
(*mem) = (void*)( ((char*)(*mem)) + skip[((unsigned long long)(*mem)) & 15] );
(*arr)=(T*)(*mem);
(*mem)=((*arr)+x);
}
template<class T> inline void walloc1d(T **arr, int x1, int x2, void **mem = &wmem){
walloc1d(arr, x2-x1, mem);
(*arr) -= x1;
}
template<class T1> void sortA_L(int N, T1 a[], void *mem = wmem){
sort(a, a+N);
}
template<class T1> void rsortA_L(int N, T1 a[], void *mem = wmem){
sortA_L(N, a, mem);
reverse(a, a+N);
}
inline int my_getchar_unlocked(){
static char buf[1048576];
static int s = 1048576;
static int e = 1048576;
if(s == e && e == 1048576){
e = fread_unlocked(buf, 1, 1048576, stdin);
s = 0;
}
if(s == e){
return EOF;
}
return buf[s++];
}
inline void rd(int &x){
int k;
int m=0;
x=0;
for(;;){
k = my_getchar_unlocked();
if(k=='-'){
m=1;
break;
}
if('0'<=k&&k<='9'){
x=k-'0';
break;
}
}
for(;;){
k = my_getchar_unlocked();
if(k<'0'||k>'9'){
break;
}
x=x*10+k-'0';
}
if(m){
x=-x;
}
}
struct MY_WRITER{
char buf[1048576];
int s;
int e;
MY_WRITER(){
s = 0;
e = 1048576;
}
~MY_WRITER(){
if(s){
fwrite_unlocked(buf, 1, s, stdout);
}
}
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
MY_WRITER_VAR.s = 0;
}
MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
my_putchar_unlocked(a);
}
inline void wt_L(int x){
int s=0;
int m=0;
char f[10];
if(x<0){
m=1;
x=-x;
}
while(x){
f[s++]=x%10;
x/=10;
}
if(!s){
f[s++]=0;
}
if(m){
my_putchar_unlocked('-');
}
while(s--){
my_putchar_unlocked(f[s]+'0');
}
}
int N;
int A[100];
int B[100];
int main(){
int i;
wmem = memarr;
int res = 0;
int tot = 0;
rd(N);
{
int Lj4PdHRW;
for(Lj4PdHRW=(0);Lj4PdHRW<(N);Lj4PdHRW++){
rd(A[Lj4PdHRW]);
}
}
{
int e98WHCEY;
for(e98WHCEY=(0);e98WHCEY<(N);e98WHCEY++){
rd(B[e98WHCEY]);
}
}
for(i=(0);i<(N);i++){
A[i] -= B[i];
}
rsortA_L(N, A);
for(i=(0);i<(N);i++){
if(tot + A[i] >= 0){
res++;
tot += A[i];
}
}
wt_L(res);
wt_L('\n');
return 0;
}
// cLay version 20201123-1
// --- original code ---
// int N, A[100], B[100];
// {
// int res = 0, tot = 0;
// rd(N,A(N),B(N));
// rep(i,N) A[i] -= B[i];
// rsortA(N, A);
// rep(i,N) if(tot + A[i] >= 0) res++, tot += A[i];
// wt(res);
// }
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