What is the output?

public class RecursionExample3 {  
  static int fun(int n){      
        if (n == 1)      
          return 1;      
        else      
          return(n + fun(n-1));      
  }      

public static void main(String[] args) {  
System.out.println("Number of 5 is: "+fun(5));  
}  
}