#include <bits/stdc++.h>
using namespace std;
int main()
{
int n , m;
cin >> n >> m;
int a[n];
for(int i = 0; i < n; i++)
{
cin >> a[i];
}
int b[m];
for(int i = 0; i < m; i++)
{
cin >> b[i];
}
sort(b , b + n);
int cnt = 0;
for(int i = 0; i < m; i++)
{
for(int j = 0; j < m;j++)
{
if(a[i] == b[j] + b[i])
{
cnt = 1;
} else {
continue;
}
}
}
if(cnt == 1)
{
cout << "YES\n";
} else {
cout << "NO\n";
}
}
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