#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(n);
	a.resize(m);
	for(auto &y : x) cin >> y;
	for(auto &y : w) cin >> y;
	priority_queue<S> q;
	for(int i = 0; i < n - 1; ++i) q.push({x[i + 1] - x[i], i, i + 1});
	for(auto &l : a) {
		auto s = q.top();
		l      = s.l;
		q.pop();
		if(s.v < n - 1) q.push({x[s.v + 1] - x[s.u], s.u, s.v + 1});
	}
	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";
}