#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y,z;
	float a,i;
	cin>>x>>y>>z;
	a=x+y+z;
	i=a/3;
	printf("%",i);
	cout<<fixed<<setprecision(1)<<a<<endl<<i;
} 
/**************************************************************
	Problem: 1602
	User: huxuanchen
	Language: C++
	Result: Wrong Answer
****************************************************************/