procedure-calling_1_input.cpp

#include <iostream>

using namespace std;

void g(int i) {
    i = i*2;
}

void f(int &i) {
    i = i+3;
    g(i);
}

int main() {
    int i;
    cin >> i;
    f(i);
    cout << i << endl;
    return 0;
}