A9515 | Valera and Number
时间限制1s
内存限制256MB
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题目描述
Valera is a coder. Recently he wrote a funny program. The pseudo code for this program is given below:
```plain
//input: integers x, k, p
a = x;
for(step = 1; step <= k; step = step + 1){
rnd = [random integer from 1 to 100];
if(rnd <= p)
a = a * 2;
else
a = a + 1;
}
s = 0;
while(remainder after dividing a by 2 equals 0){
a = a / 2;
s = s + 1;
}
```
Now Valera wonders: given the values $x$ , $k$ and $p$ , what is the expected value of the resulting number $s$ ?
```plain
//input: integers x, k, p
a = x;
for(step = 1; step <= k; step = step + 1){
rnd = [random integer from 1 to 100];
if(rnd <= p)
a = a * 2;
else
a = a + 1;
}
s = 0;
while(remainder after dividing a by 2 equals 0){
a = a / 2;
s = s + 1;
}
```
Now Valera wonders: given the values $x$ , $k$ and $p$ , what is the expected value of the resulting number $s$ ?
输入格式
The first line of the input contains three integers $x,k,p$ ( $1<=x<=10^{9}; 1<=k<=200; 0<=p<=100$ ).
输出格式
Print the required expected value. Your answer will be considered correct if the absolute or relative error doesn't exceed $10^{-6}$ .
输入输出样例
输入 #1
1 1 50
输出 #1
1.0000000000000
输入 #2
5 3 0
输出 #2
3.0000000000000
输入 #3
5 3 25
输出 #3
1.9218750000000
If the concept of expected value is new to you, you can read about it by the link:
http://en.wikipedia.org/wiki/Expected\_value
http://en.wikipedia.org/wiki/Expected\_value
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评测结果:Accepted