#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie();
  cout.tie();
  int n, m;
  cin >> n >> m;
  if (n == m) {
    cout << n << endl;
    return 0;
  }
  cout << 2 << endl;
}
