#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <cmath>
#include <vector>
#include <ctime>

using namespace std;

int main()
{
    int a,b;
    scanf("%d %d",&a,&b);
    int solution;
    b--;
    solution=a*b+1;
    cout << solution << endl;
    //system("pause");
    return 0;
}