public class T03E1{
  public static void main(String args[]){
           int x,y,i;                           //xӣyĸ
	      double sum=0;               // sumź
	        x=1;y=1;                      //ʼ
	        for(i=0;i<30;i++){
		sum += 1.0 * x / y;
		int t = x;x = y;y = x + t;
	      }
	     System.out.println("Sum=" + sum);
              }
