#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;

using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vs = vector<string>;
using vp = vector<pair<int, int>>;

#define rep(i, s, n) for (int i = (s); i < (int)(n); ++i)
#define repr(i, s, n) for (int i = (s); i >= (int)(n); --i)
#define sz(x) ((int)(x).size())

constexpr int INFI = 1001001001;
constexpr ll INFL = (1LL << 60);

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;
	int a, b;
	cin >> a >> b;
	vi p (n);
	rep(i, 0, n){
		cin >> p[i];
		if(p[i] == 1) a--;
		else if( p[i] == 2) b--;
		else a--, b--;
		if(a < 0 || b < 0) {
			cout << i +1 << endl;

			return 0;
		}

	}
	cout << -1 << endl;
	

	return 0;
}