#include <iostream>
using namespace std;

int a = 10;
int b = 20;
void add(){
    int c = 30;
    cout<<"add: "<<a<<" "<<b<<" "<<c<<endl;

}
void show(){
    cout<<"show: "<<a<<" "<<b<<" "<<c<<endl;

}
int main() { 
    add();
    show();
  cout<<"Main: "<<a<<" "<<b<<" "<<c<<endl;
  return 0; 
}