public class ForLoop 
{
   public static void main(String[] args) 
   {
      int limit = 20;                     // Sum from 1 to this value
      int sum = 0;                        // Accumulate sum in this variable

      // Loop from 1 to the value of limit, adding 1 each cycle
      for(int i = 1; i <= limit; i++)
         sum += i;                        // Add the current value of i to sum
      System.out.println("sum = " + sum);
   }
}