宅男TheBeet有一天心血来潮发誓要开始锻炼身体，他给自己订了一个计划：他在宿舍的中间摆了一个椅子，今天也就是第0天绕着椅子跑1圈，明天也就是第1天绕着椅子跑2圈，后天也就是第2天绕着椅子跑4圈，大后天也就是第3天跑8圈……以后每天跑的圈数是前一天的两倍。TheBeet对自己的计划信心满满，认为自己肯定能坚持下去。但是TheBeet数学不太好，今天是他定下计划的第N天，您来告诉他今天到底要跑多少圈。-Otaku TheBeet whim one day, vowed to start exercising, he set out a plan for himself: he put in the dormitory in the middle of a chair, today is the day 0 to run a lap around the chair, tomorrow is the 1st day around the their chairs and run two laps, the day after tomorrow is the first two days to run four laps around the chairs, Dahou Tian is the first three days to run 8 laps each day ... ... after a few laps twice the previous day. TheBeet confident of their own plans, think they can certainly stick to it. However, TheBeet mathematics is not a good plan today is that he set the first N days, you come to tell him how many laps today, He walked in the end.