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


int main() {
	
	int m;
	cin >> m;
	int aa, bb;
	cin >> aa >> bb;
	int a[m];
	int b[m] = {0};
	int n;
	cin >> n;
	for(int i = 0; i < n; i++){
		cin >> a[i];
		b[a[i]]++;
	}
	for(int i = 0; i < n; i++){
		if(b[a[i]] > 1){
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
    return 0;
}

样例都是对的