#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;


int main(){
    int n;
    int m;
    cin >> n >> m;
    long long sum = 0;
    long long sum2 = 0;
        sum+=(long long)n-1;
        sum+= (long long)((long long)n* (long long)(m-1));
    
        sum2+=(long long)m-1;
        sum2+= (long long)((long long)m*(long long)(n-1));
    if(sum < sum2)
        cout << sum << endl;
    else
        cout << sum2 << endl;
    return 0;
}