// How deep can this program recurse before it exceeds the limit?

public class Sum {

    public static int iterSum(int n) {
        int sum = 0;

        for (int i=1; i <= n; ++i) {
            sum += i;
        }
      
        return sum;
    }
    
    public static int recSum(int n) {
        if (n == 0) {
            return 0;
        }
        else {
            return n + recSum(n - 1);
        }
    }
    
	public static void main(String[] args) {
        
		int limit = Integer.parseInt(args[0]);
        System.out.println(recSum(limit));
	}
}