#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define si(X) scanf("%d", &(X))
#define sll(X) scanf("%lld",&(X))
#define INFL 0x3f3f3f3f3f3f3f3fLL
ll gcd(ll a,ll b){
	if(b==0)
	return a;
	return gcd(b,a%b);
}
string toBin(ll a) {
	string res = "";
	while (a) {
		res += char((a & 1) + '0');
		a >>= 1;
	}
	reverse(res.begin(), res.end());
	return res;
}
const int mod = 1e9+7;
ll expo(ll base,ll pow){
    ll ans = 1;
    while(pow!=0){
        if(pow&1==1){
            ans = ans*base;
            ans = ans%mod;
        }
        base *= base;
        base%=mod;
        pow/=2;
    }
    return ans;
}
ll inv(ll x){
    return expo(x,mod-2);
}
bool isPal(string ss){
    int len = ss.length();
    for(int i = 0 ; i<len/2 ; i++){
	int comp = len-i-1;
	if(ss[i]!=ss[comp])
		return false;
	}
    return true;
}
double pi = 3.141592653589793238462643;
double error = 0.0000001;
/* -------Template ends here-------- */

const int M = 100001;

int main(){
    //freopen("input.txt", "rt", stdin);
    //freopen("output.txt", "wt", stdout);

    ll n , m;
    sll(n);  sll(m);
    ll ans1 = n - 1 + n*(m - 1);
    ll ans2 = m - 1 + m*(n - 1);
    ll ans = min(ans1 , ans2);
    cout<<ans;




















}