#include <stdio.h>


int main(){
    double koef=0;
    double a;
    double rishennia;
     if (scanf("%lf",&a) != 1) {
        printf("Chyba\n");
        return 1;
         }else{ while (scanf("%lf", &koef) == 1) {
        rishennia=rishennia*a +koef;
            }
      printf("Vysledok je: %.2f\n",rishennia);
         }
    return 0;
}