#include <bits/stdc++.h>   using namespace std;   int main() {     int n;     scanf( %d , &n);     int *a = new int[n];     for (int i = 0; i < n; i++) {       scanf( %d , &a[i]);     }     int m;     scanf( %d , &m);     int bred[10000];     for (int i = 0; i < 10000; i++) bred[i] = 0;     for (int i = 0; i < m; i++) {       int b;       scanf( %d , &b);       for (int j = 0; j < n; j++) {         if (b % a[j] != 0) continue;         bred[b / a[j]]++;       }     }     for (int i = 9999; i >= 0; i--) {       if (bred[i] != 0) {         printf( %d , bred[i]);         break;       }     }     return 0;   }   