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

int main () {
int n,a,b;
cin >> n >> a >> b;
vector<int> v(n);
for(int i = 0;i < n;i++)cin >> v[i];
//for(int i = 0;i < n;i++)cout << v[i];
int ans=-1;
for(int i = 0;i < n;i++){
    if(v[i]==1){
        if(a==0){ans=i+1;break;}
        a=a-1;
    }
    if(v[i]==2){
        if(b==0){ans=i+1;break;}
        b=b-1;
    }
    if(v[i]==3){
        if(a==0){ans=i+1;break;}
        if(b==0){ans=i+1;break;}
        a=a-1;
        b=b-1;
    }
    }
cout << ans;
}