#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    
    long long int a,b,c;
    cin>>a>>b;
    c=a*b;
    c--;
    cout<<c<<endl;
    return 0;
}