Initialize Filter3 Class

#include <iostream>
using namespace std;

// Define Filter3 class here
class Filter3{
    private: 
    const int id=0;
    int coeff[3];
    int lastOutput;
    public: Filter3(int filterId, int c0,int c1, int c2):
        id(filterId),
        coeff({c0,c1,c2}),
        lastOutput(0){}
    
    void apply(int x){
        lastOutput = x * coeff[0] + coeff[1] + coeff[2]; 
    }
    int read(){
        return lastOutput;
    }
};
int main() {
    int id, c0, c1, c2;
    cin >> id >> c0 >> c1 >> c2;

    Filter3 f(id, c0, c1, c2);

    int s1, s2;
    cin >> s1 >> s2;

    f.apply(s1);
    f.apply(s2);

    cout << f.read();
    return 0;
}