#include<bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define lowbit(x) (x) & (-x)
using i64 = long long;
using pii = std::pair<int, int>;
void solve()
{
    int x, y;
    std::cin >> x >> y;
    int ans = 0;
    while (x != 3) {
    	if (x == 2 || y == 2) {
    		ans += 2;
    	} 
    	else {
    		ans ++;
    	}
    	x ++;
    }
    std::cout << ans << '\n';
}
int main()
{
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
    std::ios::sync_with_stdio(false);
    int T = 1;
    //std::cin >> T;
    while (T --) solve();
    return 0;
}