#include<stdio.h>
void main()
{
  int day,x1,x2;
  day=9;
  x2=1;
  while(day>0)
  {
    x1=(x2+1)*2;/*第一天的桃子數是第2天桃子數加1后的2倍*/
    x2=x1;
    day--;
  }
  printf("the total is %d\n",x1);
}