#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
using namespace std;

int main(){
    int i,a,b;
    float s;
    
    scanf("%d %d", &a, &b);
    printf ("%d",a*(b-1)+1);



    //system ("pause");

    return 0;
}