#include <iostream>
using namespace std; 
inline int add (int a, int b)
{return (a+b);}
inline int sub (int m, int n)
{return (m-n);}
int main() {
 int x=30,y=20;
 cout <<add (x, y)<<endl; 
 cout << sub (x, y)<<endl; 
    return 0;
}