//first question=All Possible Values
#include<iostream>
using namespace std;
int main() {
 int s,max=0;
  cin>>s;
 for(int i=0;i<=s;i++)
 for(int j=0;j<=s;j++)
  for(int k=0;k<=s;k++)
  if((i+j+k)==s)
max++;
cout<<max;
  
  return 0;
}
...................................................
2=guessing game 3
#include<iostream>
using namespace std;
int main() {
int t,g1,g2,g;
  cin>>t;
  while(t--){
cin>>g1>>g2;
    for(int i=1; ; i++){
cin>>g;
 if(g1-g2==g){
cout<<"Well guessed! the number of tries = "<<i<<endl;
   break;
 
 }
 else if((g1-g2)>g)
   cout<<"Sorry, the number is low. Try again."<<endl;
      else
    cout<<"Sorry, the number is high. Try again."<<endl;
 
    }
  
 cout<<endl;
  }
 
  return 0;
}
..............................................................
third question
#include <iostream>
using namespace std;
 
bool prime(int n){
    for(int i=2;i*i<=n;i++){
        if(n%i==0)
        return false;
        
    }
    return true;
}
int thirdnum(int a,int b){
    int sum=0,temp=0;
    sum=a+b;
    temp=1;
    if(sum&1){
        temp=2;
    }
    while(!prime(sum+temp)){
        temp+=2;
    }
    return temp;
}
int main() {
    
	int test;
	cin>>test;
	for(int i=0;i<test;i++){
	    int x,y;
	    cin>>x>>y;
	    cout<<thirdnum(x,y)<<"\n";
	}
	return 0;
}
........................................................
last question.....
#include <iostream>
using namespace std;
// nor=normal
int main() {
int g,n,age,d;
  cin>>g;
for(int i=1;i<=g;i++){
  int risk=0,nor=0;
cin>>n>>d;
 for(int j=1;j<=n;j++){
   
   cin>>age;
   if(age>=80 || age<=9)
     risk++;
}
  nor=n-risk;
  int tot=risk/d +nor/d;
  if(nor%d !=0) tot++;
  if(risk%d !=0)tot++;
  cout<<"Require days in governorate "<<i<<" is: "<<tot;
  if(i!=g)
    cout<<endl;
  
 
  
}
 
    
return 0;
}