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#include <iostream>

#include <stdio.h>

#include <math.h>

#include <string.h>

using namespace std;

const int MAXN = 51;

int as[MAXN];

int bs[MAXN];

int n1, n2;

const double eps = 1e-10;

int ok[100001];

int main(){

memset(ok,0,sizeof(ok));

cin>>n1;

for(int i=0; i<n1; i++)cin>>as[i];

cin>>n2;

for(int i=0; i<n2; i++)cin>>bs[i];

int ans = -1;

for(int i=0; i<n1; i++){

for(int j=0; j<n2; j++){

double t = bs[j]*1.0/as[i];

if( t==bs[j]/as[i]){

ok[ bs[j]/as[i] ] += 1;

}

}

}

for(int i=100000; i>=0; i--){

if(ok[i]){

cout<<ok[i]<<endl;

break;

}

}

return 0;

}