Sum of the first n natural numbers

Sum_Upto_n.java

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+/*
+Write a Java program that takes a user input integer n and calculates the sum of the first n natural numbers.
+
+The program should use a for loop to calculate the sum.
+
+Sample Input:
+---------------------
+5
+
+Sample Output:
+---------------------
+The sum of first 5 natural numbers is 15.
+
+Explanation:
+---------------------
+The first 5 natural numbers are: 1, 2, 3, 4, 5
+Their sum is: 1 + 2 + 3 + 4 + 5 = 15
+
+*/
+import java.util.*;
+public class Sum_Upto_n {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int k = sc.nextInt();
+        int sum=0;
+        for (int i = 1; i <= k; i++) {
+            sum+=i;
+        }
+        System.out.println(sum);
+    }
+}