猴子偷桃

#include<stdio.h>

int main()

{

     int n,i,s;

    while(scanf("%d",&n)!=EOF)

    {

      s=1;

      for(i=1;i<n;i++)

      {s=(s+1)*2;}

      printf("%d\n",s);

    }

return 0;

}

轉載于:https://www.cnblogs.com/ostrich-sugar/p/7894017.html