#include<bits/stdc++.h>
using namespace std;
using ll=long long;

#include<atcoder/math>
using namespace atcoder;

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

    ll N,A,B;
    cin>>N>>A>>B;
    vector<ll> P(N);
    for(int i=0;i<N;i++){
        cin>>P[i];
        if(P[i]==1)A--;
        else if(P[i]==2)B--;
        else{
            A--;B--;
        }
        if(min(A,B)<0){
            cout<<i+1<<"\n";
            return 0;
        }
    }
    cout<<-1<<"\n";
}