#include <iostream>
using namespace std;

int sum()
{
	int s=0;
	int data;
	for(int i=0; i<3; i++)
	{
		cout << "input number " << i+1 << ":";
		cin >> data;
		s += data;
	}
	return s;
	cout << "you cannot see me" << endl;
}
int main()
{
	int result = sum();
	cout << "sum=" << result << endl;
	return 0;
}