#include <bits/stdc++.h>
using namespace std;

#define _ ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define itloop(it,x) for(auto it=x.begin();it!=x.end();it++)
#define reloop(i,e,b) for(auto i=e;i>=b;i--)
#define loop(i,b,e) for(auto i=b;i<=e;i++)
#define ALL(x) x.begin(),x.end()
#define SZ(x) x.size()
#define PB push_back
#define MP make_pair
#define F first
#define S second
typedef long long LL;
typedef vector<int> VI;

int n,k,col,x;
map<int,int> m;

int main() {_
   cin >> n >> k;
   loop(i,1,n) {
      cin >> col;
      m[col]++;
   }
   loop(i,1,k) {
      cin >> x;
      if(x > m[i]) {
         cout << "NO";
         return 0;
      }
   }
   cout << "YES";
}