#include <iostream>
using namespace std;

int add(int num1, int num2) {  
  int sum = num1 + num2;
  return sum;
}

int add(int num1, int num2, int num3) {  
  int sum = num1 + num2 + num3;
  return sum;
}

double add(double num1, double num2) {  
  double sum = num1 + num2;
  return sum;
}

double add(double num1, double num2, double num3) {  
  double sum = num1 + num2 + num3;
  return sum;
}

int main() {
  cout << "3 + 5 = " << add(3, 5) << endl;
  cout << "4 + 2 + 8 = " << add(4, 2, 8) << endl;
  cout << "3.5 + 4.2 = " << add(3.5, 4.2) << endl;
  cout << "2.1 + 3.7 + 8.2 = " << add(2.1, 3.7, 8.2) << endl;
  return 0;
}