import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner x = new Scanner(
System.inin);
System.
out.print("\n Enter value number: ");
int N=x.nextInt();
int sum = 0, i = 1;
while(i <= N)
{
sum += i;
i++;
}
System.
out.println("Sum = " + sum);
}
}
Сделал спасибо вам