int main(int argc, char** argv) {
    float i,o,a = 0,b = 0,a1 = 0,b1 = 0,h = 0, s1 = 0, s2 = 0, v = 0, s3=0, s4=0, s=0;
    printf("Zadejte velikosti a a b:\n");
    scanf("%f%f", &a, &b);
    //printf("%f", a);

    printf("Zadejte velikosti a' a b':\n");
    i=scanf("%f%f", &a1, &b1);
    if (i!=2) {
    printf("Nespravny vstup.\n");
    return 0;}

    printf("Zadejte velikost h:\n");
    i=scanf("%f", &h);
    if (i!=2) {
    printf("Nespravny vstup.\n");
    return 0;}
    /**s1=a*b;
    printf("%f\n", s1);
    s2=a1*b1;
    printf("%f\n", s2);
    sq=sqrt(s1*s2);
    printf("%f\n", sq);
    v=1/3*h*(s1+sq+s2);**/

    s1=a1*b1*h;
    s2=(b-b1)/2*h*a1;
    s3=(a-a1)/2*h*b1;
    s4=(a-a1)*(b-b1)*h/3;

    s=s1+s2+s3+s4;

    printf("Objem: %f", s);

    //printf("%f", s1);
    return (EXIT_SUCCESS);
}