import java.io.*;

public class HealthApp{

    public static void main(String []args) throws IOException{

        //Define the array to store Student objects
        Student[] patients = new Student[50];
        
        //Define the variable to read from file
        BufferedReader inFile = new BufferedReader(new FileReader("student.txt"));          
        
        //Define the variable to store name
        String tempName;
        
        //Define the variable to store age
        int tempAge;
        
        //Define the variable to store gender
        char tempGender;

        //Define the variable to store the actual number of student records
        int count;
        count = 0;
        
        while ((tempName = inFile.readLine())!=null){
                 tempAge = Integer.parseInt(inFile.readLine());
                 tempGender = inFile.readLine().charAt(0);
                 patients[count] = new Student(tempName, tempAge, tempGender);
                 count++;
        }
    
    System.out.println("The average student age is: " + Math.round(AverageAge(patients, count)));
    System.out.println("The oldest student is : " + OldestStudent(patients, count));
    System.out.println("The total number of males in the group is : " + NumMales(patients, count));
    inFile.close();
    }
    
    public static double AverageAge(Student[] x, int actualNumOfStudents){
       
       //Define the variable to store the average age
       double avAge;
       
       //Define the variable to store the sum age
       int tempSum;
       tempSum = 0;
       
       //Use for loop to calculate the sum age
       for(int i = 0; i < actualNumOfStudents; i++)
          tempSum += x[i].getAge();
       
       //Calculate the average age
       avAge = (double)tempSum/(double)actualNumOfStudents;
       
       return avAge;
    }

    public static String OldestStudent(Student[] x, int actualNumOfStudents){
        
        //Define the variable to store the name who has the oldest age
        String oldest = "";
        
        //Define the variable to store the oldest age
        int oldestAge = 0;
        
        for(int i = 0; i < actualNumOfStudents; i++)
        {
            if(x[i].getAge() > oldestAge){
                oldestAge = x[i].getAge();
                oldest = x[i].getName();
            }
        }
    return oldest + ", age " + oldestAge;
    }
    
    public static int NumMales(Student[] x, int actualNumOfStudents){

        //Define the variable to store the number of males
        int maleSum=0;

        for(int i=0; i < actualNumOfStudents; i++){
            if(x[i].getGender() == 'M'){
                maleSum++;
            }
        }

        return maleSum;
    }

}