#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define l(a, b, i) for (ll i = a; i < b; i++)
#define rl(a, b, i) for (ll i = a; i >= b; i--)
#define vpair vector<pair<ll, ll>>
#define inf LLONG_MAX
#define ninf LLONG_MIN
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen("selfstudy.inp", "r", stdin);
//freopen("selfstudy.ans", "w", stdout);
ll N, M; cin >> N >> M; vector<ll> vecA(N + 1, 0), vecB(N + 1, 0);
l(1, N + 1, i) cin >> vecA[i];
l(1, N + 1, i) cin >> vecB[i];
ll ans = inf;
l(1, N + 1, i) {
ll curmax = max(vecA[i], vecB[i]);
ans = min(ans, curmax);
}
cout << ans;
}
