CPZT ACGO

#include <iostream>
#include <cmath>
using namespace std;
int main(){
    int p0 = 0,z1 = 0,pz;
    for(int i = 1;i <= 8;i++){
        cin >> pz;
        if(pz == 1) {
            z1++;
    	}else {
            p0++;
        }
    }
    cout << abs(p0-z1)/4;
    return 0;
}