#include<iostream>
using namespace std;

void printHello(){
   cout<<"Hello"<<endl;
}

int add(int a,int b){

   return (a+b);
}

int square(int a);

int main(){

    printHello();
    // cout<<"World";

      int c = add(2,3);
      cout<<c<<endl;

      cout<<square(10);

    return 0;
}

int square(int a){
   int ans = a*a;
   return ans;
}