#include <stdio.h>

int main() {
    float pole[20];
    int opakovania = 0;
    float cislo;

    while (opakovania < 20) {
        if (scanf("%f", &cislo) == EOF) {
            break;
        }
        pole[opakovania] = cislo;
        opakovania++;
    }

    float result = pole[1];

    for (int i = 2; i < opakovania; ++i) {
        result = result * pole[0] + pole[i];
    }

    result = ((int)(result * 100 + 0.5)) / 100.0;

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

    return 0;
}