#include <stdio.h>

main(int argc,char ** argv)
{  int a,b,c,x;
   printf("a: "); scanf("%d",&a);
   printf("b: "); scanf("%d",&b);
   printf("c: "); scanf("%d",&c);
   printf("x: "); scanf("%d",&x);
   printf("%d\n",a*x*x+b*x+c);
}