#include <bits/stdc++.h>

using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)
#define SZ(a) int(a.size())
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	cin >> n;
	VI v(n - 1);
	int last = -1;
	
	int cnt = 0;
	FOR (i, 0, n - 1)
	{
		cin >> v[i];
		if (i == 0)
			v[i] = 1;
		if (v[i] == 1)
			last = i;
		else
			cnt++;
	}
	
	cout << max(n - 1 - last, 1 + (cnt > 0)) << '\n';	
	
	
	return 0;
}