#include <iostream>
using namespace std;
void func1(int a) {
    a = 5;
}
void func2(int & a) {
    a = 5;
}
int main() {
    int x = 1;
    cout << x << endl;
    func1(x);
    cout << x << endl;
    func2(x);
    cout << x << endl;
    return 0;
}