#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ double a,b,c,d,x; cin>>a>>b>>c>>d>>x; f(x)=a*x^3+b*x^2+c*x+d; printf("%.5lf",f(x)); return 0; }