/*
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n , m;
scanf("%d %d" , &n , &m);
vector<int> a(n) , b(m);
for (auto & x : a)scanf("%d" , &x);
for (auto & x : b)scanf("%d" , &x);
for (auto x : a){
bool flag = false;
for (int mask = 0; mask < (1 << m); mask++){
int sum = 0;
for (int i = 0; i < m; i++)
if (mask & (1 << i))sum += b[i];
if (sum == x){
flag = true;
break;
}
}
if (!flag){
puts("nO");
return 0;
}
}
puts("YES");
}*/
#include <bits/stdc++.h>
using namespace std;
string solve(int n, int m, vector<int>& a, vector<int>& b) {
sort(a.begin(), a.end());
sort(b.begin(), b.end());
for (int i = 0; i < n; i++) {
int ind = -1;
for (int j = 0; j < m; j++) {
if (b[j] <= a[i]) {
ind = j;
} else {
break;
}
}
if (ind == -1) {
return "nO";
}
b.erase(b.begin() + ind);
m--;
}
return "YES";
}
int main() {
int n, m;
cin >> n >> m;
vector<int> a(n);
vector<int> b(m);
for (int i = 0; i < n; i++) {
cin >> a[i];
}
for (int i = 0; i < m; i++) {
cin >> b[i];
}
cout << solve(n, m, a, b) << endl;
return 0;
}
