#include <algorithm>
#include <array>
#include <chrono>
#include <climits>
#include <cmath>
#include <cstdlib>
#include <deque>
#include <forward_list>
#include <functional>
#include <iostream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <regex>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <valarray>
#include <vector>

using namespace std;

long long nbCuts(long long n, long long m)
{
	return min(n - 1 + n * (m - 1), m - 1 + m * (n - 1));
}

int main()
{
	ios::sync_with_stdio(false);

	long long n, m;
	cin >> n >> m;
	cout << nbCuts(n, m) << endl;

	return 0;
}