main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()
int main() { F_OO(); return printf("%1.3f\n", 4.*-++F/OO/OO); }
int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()