#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;

bool check(int t[],int col[],int n,int m,int d,int range) {
   map<int,int> mp;
   loop(i,d,d+range)
      mp[t[i]]++;
   loop(i,1,m) {
      if(mp[i] != col[i])
         return false;
   }
   return true;
}

int n,m,k,t[101],col[101],s;
bool flag=false;

int main() {_
   cin >> n >> m;
   loop(i,1,n)
      cin >> t[i];
   loop(i,1,m) {
      cin >> col[i];
      s += col[i];
   }
   loop(i,1,n-s+1) {
      if(check(t,col,n,m,i,s)) {
         flag = true;
         break;
      }
   }
   puts(flag ? "YES" : "NO");
}