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

#define MAX_LINE_LENGTH 256

bool IsValidNumber(const char *line) {
    char *endFtr;
    strtod(line, &endFtr);
    return endFtr != line;
}

int main() {
    char line[MAX_LINE_LENGTH];
    double result = 0;
    int exponent = 2;

    if (fgets(line, MAX_LINE_LENGTH, stdin) == NULL || !IsValidNumber(line)) {
        printf("Nepodarilo sa nacitat zaklad x\n");
        return 1;
    }

    double x = strtod(line, NULL);
    result += 1;

    while (1) {
        if (fgets(line, MAX_LINE_LENGTH, stdin) == NULL || !IsValidNumber(line)) {
            if (line[0] == '\n') {
                break;
            }
            printf("Nepodarilo sa nacitat polynom\n");
            return 1;
        }

        x = strtod(line, NULL);
        result = result * x + 1;

        exponent--;
    }

    printf("Vysledok je: %.2f\n", result);
    return 0;
}