#include<iostream>
#include<string>
#include<fstream>
#include<iomanip>

using namespace std;

struct INDIVIDUAL
{
	string fname;
	string lname;
	float salary;
};

INDIVIDUAL GetData(ifstream &);
double CalcAvg(double total, int people);

int main()
{
	ifstream file;
	file.open("input.txt");
	
	INDIVIDUAL people[20];
	int total_people = 0;
	
	
	// GET ALL THE PEOPLE FROM THE FILE
	while( !file.eof())		
		people[total_people++]=GetData(file);

	string temp;
	double total_salary = 0.0;
	int many_people = 1;
	double average = 0.0;

	cout<<"Last name"<<setw(15)<<"Avg. Income"<<setw(20)<<"No. of members"<<endl;
	cout<<"------------------------------------------"<<endl;

	// GO THROUGT THE WHOLE ARRAY
	for (int i=0; i<total_people; i++)
	{
		temp = people[i].lname;
		total_salary = people[i].salary;

		//same last name
		i++;
		while(temp == people[i].lname)
		{
			total_salary += people[i].salary;
			many_people++;
			
			i++;
		}

		i--;

		average = CalcAvg( total_salary,  many_people);

		cout<<setw(7)<<temp<<setw(15)<<fixed<<setprecision(2)<<average<<setw(15)<<many_people<<endl;

		many_people=1;
		cout<<endl<<endl;
	}

	return 0;	
}
double CalcAvg(double total, int people)
{
	double av;
	double p = double(people);

	av = double(double(total)/double(p)) ;

	av =av + 0.005; 
	av *=100.0;//moves the comma 2 to right
	av = int(av) / 1; //integer division to cut off numbers after comma
	av = av / 100.0; // float division to move comma 2 to left

	return av;
}


INDIVIDUAL GetData(ifstream & infile)
{
	INDIVIDUAL temp;

	infile>>temp.lname;
	infile>>temp.fname;
	infile>>temp.salary;

	return temp;
}