function processData(input) {
    //Enter your code here
    var data = input.split(" ").map(Number);
    var m = data[0],n = data[1];
    var cuts = 0;
    if(m > n) {
        cuts += n - 1;
        cuts += n * (m - 1);
    }else {
        cuts += m - 1;
        cuts += m * (n - 1);
    }
    console.log(cuts);
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});