#include <iostream>
using namespace std;
int main(){
int n, m , k;
cin >> n >> m >> k;
int first_type = , second_type = ;
for(int i = ; i < n ; ++ i){
int a;
cin >> a;
(a == ) ? first_type++ : second_type ++ ;
}
int wash_number = ;
if(first_type - m >= ){
wash_number = first_type - m;
m = ;
}else{
m -=first_type;
}
if(second_type - m > ){
second_type-=m;
wash_number += (second_type-k > ? second_type-k : );
}
cout<<wash_number<<endl;
}