#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y,z,c;
	double ans;
	cin>>x>>y>>z;
	c=x+y+z;
	ans=c/3.0;
	cout<<c<<endl;
	printf("%.1f",ans);
}



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