#include<cstdio>
long long n,m,nr,p;
int main(){
    scanf("%lld%lld",&n,&m);
    if( n > m )
        nr = ( n - 1 ) + ( m - 1 ) * n ;
    else
        nr = ( m - 1) + ( n - 1 ) * m;

    printf("%lld",nr);


    return 0;
}