#include <iostream>
using namespace std;
 
int main() {
	// Komentar/comment: kasi keterangan
	// int = integer = bil bulat
	// double = bil desimal
	// int angka <- 123+321;
	double angka1, angka2, angka3;
	cin >> angka1 >> angka2 >> angka3;
	// hitung rata-rata 3 angka tsb.
	// - jumlahkan 3 angka tsb
	double jumlah = angka1+angka2+angka3;
	// - bagi jumlah dengan 3
	double rata2=jumlah/3;cout<<rata2<<endl;int komentar;
	// Operasi2:
	// Aritmatika: +,-,*,/,%
	// integer division -> modulo = %
	// modulo = sisa bagi, division = hasil bagi
	// 15/4 = 3
	// 15%4 = 3
	// 15 = 3*4 + 3
 
	// Assignment: =, +=, -=, *=, /=, %=
	// rata2 += 1.5;
	rata2 = rata2+1.5;
	cout << rata2 << endl;
	return 0;
}
 
 
 
 
 
 

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