#include <bits/stdc++.h>
#define ull unsigned long long
#define ll long long
#define el endl
#define nl '\n'
using namespace std;
void input()
{
if (fopen("in.txt", "r"))
{
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
}
}
int sum(int x, int y, int z)
{
int sum;
sum = x + y + z;
return sum;
}
double avr(int x, int y, int z)
{
double av;
av = x + y + z / 3.0;
return av;
}
int main()
{
input();
int a, b, c;
cin >> a >> b >> c;
cout << "the summation and the average in order: " << sum(a, b, c) << " : " << avr(a, b, c) << nl;
return 0;
}
// 1
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