#include<bits/stdc++.h>
using namespace std;
double f(double a,double b,double c,double d,double x){
	return a*x*x*x+b*x*x+c*x+d;
}
int main(){
	double a,b,c,d,x;
	cin>>x>>a>>b>>c>>d;
	printf("%0.7lf",f(a,b,c,d,x));
	return 0;
}