public class Program

{

    public void Main()

    {

        var vessel_id = "";

        var imo_no = "";

        var official_no = "";

        var flag = "";

        var port_reg = "";

        if(vessel_id.StartsWith("F")) {

            processCertificate();

            return;

        }

        var shipProfile = getShipProfile(vessel_id);

        if(shipProfile != null && shipProfile == "active") {

            updateProfile();

            processCertificate();

            return;

        }

        disableShipIfExist(imo_no,port_reg,flag);

        disableShipIfExist(official_no,port_reg,flag);

        insertShipProfileWithCert();

    }

    public void disableShipIfExist(string s1, string s2, string s3) {

    }

    public void insertShipProfileWithCert() {

    }

    public void updateProfile() {

    }

    public void processCertificate() {

    }

    public string getShipProfile(string s1) {

        return "";

    }

}