#include <iostream>
using namespace std;
int sum(int a, int b = 20)
{
   int result;
   result=a+b;
   return (result);
}
int main ()
{
   int a=100;
   int b=200;
   int result;
   result=sum(a, b);
   cout<<"Total value is :"<<result<<endl;
   result = sum(a);
   cout<<"Total value is :"<<result<<endl;
   return 0;
}