#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define ll long long
#define endl '\n'
#define pb push_back
#define fi first
#define se second
#define pii pair<int, int>
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, m;
cin >> n >> m;
int mas[n][2];
int atb[n]={};
for(int i=0; i<n; i++)
{
cin >> mas[i][0];
atb[i]=mas[i][0];
}
for(int i=0; i<n; i++)
{
cin >> mas[i][1];
atb[i]=max(mas[i][1], atb[i]);
}
sort(atb, atb+n);
cout << atb[0] << endl;
return 0;
}
