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

int is_valid_number(const char *s) {
	char *endptr;
	if (s[0] == '\0' || s[0] == '\n') return 1;
	strtod(s, &endptr);
	while (*endptr == ' ' || *endptr == '\t' || *endptr == '\n') endptr++;
	return *endptr == '\0';
}

int main(){
    char line[100];
    double x = 0, a = 0, b = 0, c = 0, y;

    fgets(line, 100, stdin);
    if(!is_valid_number(line)){
        return 0;
    }
    x = strtod(line, NULL);

    fgets(line, 100, stdin);
    if(!is_valid_number(line)){
        return 0;
    }
    a = strtod(line, NULL);

    fgets(line, 100, stdin);
    if(!is_valid_number(line)){
        return 0;
    }
    b = strtod(line, NULL);

    fgets(line, 100, stdin);
    if(!is_valid_number(line)){
        return 0;
    }
    c = strtod(line, NULL);

y = x*x*a+b*x+c;
printf("Vysledok je: %.2f\n", y);
    return 0;
}