#include <bits/stdc++.h>
#define fio ios_base::sync_with_stdio(0);cin.tie(0);
#define ll long long
#define pb push_back
#define fi first
#define se second
#define en exit(0);
using namespace std;
const int N = 3e5 + 5;
const int INF = 1e9 + 5;
int a[N], b[N];
int main()
{
fio
// ifstream cin("in.in");
int n, m;
cin >> n >> m;
for(int i = 1;i <= n;i++)
cin >> a[i];
for(int i = 1;i <= n;i++)
cin >> b[i];
int res = INF;
for(int i = 1;i <= n;i++)
res = min(res, max(a[i], b[i]));
cout << res;
return 0;
}
