#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  int price;
  string answer = "";
  price = N * 1.08;
  if(price < 206){
    answer = "Yay!";
  }
  else if(price == 206){
    answer = "so-so";
  }
  else{
    answer = ":(";
  }
  cout << answer << endl;
}
#include <bits/stdc++.h>
using namespace std;

int main(){
    int N; 
    cin >> N;
    
    int count = 0;
    int sub = 1;
    while(1){
        count += sub;
        
        if (count >= N){
            cout << sub<< endl;
            break;
        }
        sub += 1;

    }
}