public class Operation3_2{
public static void main(String args[]){
int sum=0,i=1;
while(i<=1000){
if((i%3==0&&i%7==0)==true){
sum=sum+i;
}
i++;
}
System.out.println("1000以內能同時被3和7整除的整數之和為:"+sum);
}
}