for文

class Test3 {

	 public static void main (String args []) {
	 	int A = 100;
	 	int B = 0;
	 	int i = 1;
	 	for (i = 1; i <= A; i++) {
	 		B = B + i;
	 	}
	 	System.out.println ("GOUKEI: " + B);
	}
	
}