#include <bits/stdc++.h>
using namespace std;

int main()
{
    double x,a,b,c,d;
    cin >>x>>a>>b>>c>>d;
    double fx_Num;
    fx_Num = a*x*x*x + b*x*x + c*x + d;
    cout << fixed << setprecision(7) << fx_Num;
    return 0;
}