#include <bits/stdc++.h>
using namespace std;
int const N = 2e5 + 5;
int a[N];
int n, ac, b;
int main() {
  cin >> n >> b >> ac;
  int temp1 = b;
  int temp2 = ac;
  for (int i = 0; i < n; i++) cin >> a[i];
  int i;
  for (i = 0; i < n; i++) {
    if (temp1 == 0 && temp2 == 0) break;
    if (a[i] && temp1 && temp2 != ac) {
      temp1--;
      temp2++;
    } else {
      if (temp2 > 0)
        temp2--;
      else if (temp1 > 0)
        temp1--;
    }
  }
  cout << i << endl;
}
