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

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        int i,num=10,sum=0;
        for(i=1;i<=num;++i)
            {
                sum=sum+i;
            }
        System.out.println("Sum of first 10 natural numbers is="+sum);
    }
}