#include <iostream>
using namespace std;


int A(int S);
void B(int X,int Y);
int C1(int X);


int main()
{
    A(123);
    B(12,13);
    cout << C1(123) << endl;
}
int A(int S)
{
    cout << S << endl;
    return 0;
}
void B(int X,int Y)
{
    cout << X+Y << endl;
    cout << X-Y << endl;
    cout << X*Y << endl;
    cout << X/Y << endl;
}
int C1(int X)
{
    return X;
}