#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int boy_count;
int girl_count;
cin >> boy_count >> girl_count;
int boy_max_ce = 0;
for (int i = 0; i < boy_count; i++) {
int ce;
cin >> ce;
boy_max_ce = max(boy_max_ce, ce);
}
int girl_max_ce = 0;
for (int i = 0; i < girl_count; i++) {
int ce;
cin >> ce;
girl_max_ce = max(girl_max_ce, ce);
}
cout << boy_max_ce + girl_max_ce;
return 0;
}
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