#include<bits/stdc++.h>
using namespace std;
int main() {
	float x,y,z,p,q;
	cin>>x>>y>>z;
	q=x+y+z;
	p=q/3.0;
	cout<<q<<endl;
	cout<<fixed<<setprecision(1)<<p;
    return 0;
}

/**************************************************************
	Problem: 1602
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/