#include <bits/stdc++.h>
using namespace std;
struct S {
	int l, u, v;
};
bool operator<(const S &l, const S &r) { return tie(l.l, l.u) > tie(r.l, r.u); }
int main() {
	int n, m;
	cin >> n >> m;
	if(m > n * (n - 1) / 2) return cout << "no\n", 0;
	vector<int> x(n), w(m), a;
	a.reserve(n * (n - 1) / 2);
	for(auto &y : x) cin >> y;
	for(auto &y : w) cin >> y;
	for(int i = 0; i < n - 1; ++i)
		for(int j = i + 1; j < n; ++j) a.push_back(x[j] - x[i]);
	sort(a.begin(), a.end());
	sort(w.begin(), w.end());
	for(int i = 0; i < m; ++i)
		if(w[i] < a[i]) return cout << "no\n", 0;
	cout << "yes\n";
}