#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll max(ll a)
{
	if (a >= 2) return a;
	return 2;
}
int main()
{
	int n;
	cin >> n;
	ll a, ans = 0;
	bool flag = false;
	while (n--)
	{
		scanf("%lld", &a);
		if (a == 1 || a == 0) flag = true;
		ans += max(a);
	}
	if(n==0)
	{
	    cout<<a<<endl;
	    return 0;
	}
	if (flag) ans--;
	cout << ans;
	return 0;
}