import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static int recursiveSum(int num) {
        if(num <= 1)
            return num;
        
        return num + recursiveSum(num - 1);
        
    }
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(recursiveSum(10));

	}
}


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