36: Calculate the polynomial value. 36: Calculate the polynomial.

36: Calculate the polynomial value. 36: Calculate the polynomial.
36: Calculate the polynomial Value

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Total time limit:

1000 ms

 

Memory limit:

65536kB

Description

Assume that the polynomial form is xn + xn-1 +... + X2 + x + 1: calculate the value of this polynomial when given single-precision floating point number x and positive integer n.

Input

Enter only one line, including x and n, separated by a single space. X is in the float range, n <= 1000000.

Output

Output a real number, that is, the polynomial value, accurate to two digits after the decimal point. Ensure that the final result is within the float range.

Sample Input

2.0 4

Sample output

31.00

 1 de<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<cmath> 5 using namespace std; 6 int main() 7 { 8     float x; 9     int n;10     float tot=0;11     cin>>x>>n;12     int a=n;13     for(int i=n;i>=1;i--)14     {15         tot=tot+pow(x,a);16         a--;17     }18     printf("%.2f",tot+1);19     return 0;20 }