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#include <iostream>
#include <cmath>
#include <iomanip>
#include <sstream>
using namespace std;
int main()
{
double x,ncoef=0,coef,result=0,deg=0;
string str;
stringstream sstream;
cin >> x;
while(1)
{
cin >> str;
if(cin.eof())
{
break;
}
sstream << str << " ";
ncoef++;
}
for(int i = ncoef; i > 0; i--)
{
sstream >> coef;
result += coef*pow(x,i-1);
}
cout << setprecision(4) << fixed << result << endl;
return 0;
}
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