HCPP

#include<bits/stdc++.h>
using namespace std;
#define ll int64_t
#define lu uint64_t
#define ls short
//#define clone cin
//#define poste cout


int main(){
ifstream clone("warriors.in");
ofstream poste("warriors.out");
ll n; clone >> n;
ls v;
ll pb=0,nb=0;

for(ll i=0;i<n;i++){
     clone >> v;
     if(v==1){pb++;}else {nb++;}
}
if(pb>=nb){poste << 0; return 0;}


poste <<(n-(n/2))-pb ;
poste << endl; return 0;}




//l2