#include <iostream>
using namespace std;

int Sum(int x, int y, int z);

int main()
{
   int a, b, c;
   cout << "Type three numbers: ";
   cin >> a >> b >> c;

   int z = Sum(a, b, c);		// this is valid call synax
   cout << "z = " << z << '\n';






}

int Sum(int x, int y, int z)
{
   return x + y + z;

}