#include <bits/stdc++.h>   using namespace std;   void __print(int x) { cerr << x; }   void __print(long x) { cerr << x; }   void __print(long long x) { cerr << x; }   void __print(unsigned x) { cerr << x; }   void __print(unsigned long x) { cerr << x; }   void __print(unsigned long long x) { cerr << x; }   void __print(float x) { cerr << x; }   void __print(double x) { cerr << x; }   void __print(long double x) { cerr << x; }   void __print(char x) { cerr <<      << x <<     ; }   void __print(const char *x) { cerr <<     << x <<    ; }   void __print(const string &x) { cerr <<     << x <<    ; }   void __print(bool x) { cerr << (x ?  true  :  false ); }   template <typename T, typename V>   void __print(const pair<T, V> &x) {     cerr <<  { ;     __print(x.first);     cerr <<  , ;     __print(x.second);     cerr <<  } ;   }   template <typename T>   void __print(const T &x) {     int f = 0;     cerr <<  { ;     for (auto &i : x) cerr << (f++ ?  ,  :   ), __print(i);     cerr <<  } ;   }   void _print() { cerr <<  ] n ; }   template <typename T, typename... V>   void _print(T t, V... v) {     __print(t);     if (sizeof...(v)) cerr <<  ,  ;     _print(v...);   }   int n, m;   vector<int> me, a, nme;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n >> m;     int num;     for (int i = 1; i <= n; i++) {       cin >> num;       me.push_back(num);     }     for (int i = 1; i <= m; i++) {       cin >> num;       a.push_back(num);     }     for (int i = 0; i < 30; i++) {       for (int j = 0; j < me.size(); j++) {         if (me[j] & (1 << i)) {           nme.push_back((1 << i));         }       }     }     sort(a.begin(), a.end());     int ans = 0;     int cm = 0;     for (int i = 0; i < nme.size(); i++) {       while (cm < a.size() and nme[i] >= (1 << a[cm])) {         nme[i] -= (1 << a[cm]);         cm += 1;         ans += 1;       }     }     cout << ans;     return 0;   }   