#include <stdio.h>
#include <stdlib.h>

#define SIZE 100

int main() {
    double coefs[SIZE] = {0.0};
    double x = 0.0;
    double input = 0.0;
    int count = 0;
    int length = 0;
    double result = 0.0;

     while (count < SIZE) {
        if (scanf("%lf", &input) != 1 && input == '\n') {
            printf(":(");
            break;

        coefs[count] = input;
        count++;
    }

    x = coefs[0];
    length = count;

    for (int i = 1; i < length; i ++){
	result = result * x + coefs[i];
    }

    printf("Vysledok je: %.2lf\n", result);

    return 0;
}