public class Ik8 {

   

    public static void main ( String[] args ) {

       

        // 変数宣言

        int total = 0;

       

       

        // 100回繰り返し

        for ( int i = 0; i < 100; i++ ) {

           

            total = total + ( i + 1 );

        }

       

        System.out.println( total );

       

    }

   

}