#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
//using mint = modint1000000007;
typedef long long ll;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> T;
template<typename T>bool chmax(T& a, const T& b) { if (a < b) { a = b;return true; } else { return false; } }
template<typename T>bool chmin(T& a, const T& b) { if (a > b) { a = b;return true; } else { return false; } }
template<class... Args> void dbg(Args&&... args) { ((cout << args << ' '), ...);cout << '\n'; }

const int di[] = { -1,0,1,0 };
const int dj[] = { 0,-1,0,1 };
const long long INF = 6000000000000000000;
const int inf = 1001001001;


int main(void) {
    int n; cin >> n;
    int a, b; cin >> a >> b;
    vector<int> p(n, 0);
    for (int i = 0; i < n; i++) {
        cin >> p[i];
    }

    for (int i = 0; i < n; i++) {
        if (p[i] == 1)a--;
        else if (p[i] == 2)b--;
        else {
            a--;b--;
        }
        if (a == -1 || b == -1) {
            cout << i + 1 << "\n";
            return 0;
        }
    }
    cout << -1 << "\n";
}