#include <stdio.h>

int main(void) {

    float x = 1;
    float coefficients[] = {1, -4, 3, -2, 1, -9};
    float result = 0;

    for (int i = 0; i < sizeof(coefficients)/sizeof(float); i++) {
        result = coefficients[i] + result*x;
    }

    printf("%f\n", result);
    
    return 0;
}