#include <stdio.h>
int main() {
int a,b,c,i,z;
float x,w;
for(i=0;i<10;i++) {
scanf("%i %i %i %f",&a,&b,&c,&x);
w = a*x*x + b*x + c;
z = (int) w;
if(w==z)
{
printf("%.f \n", w);
}
else{
printf("%f \n",w);
}
}
return 0;
}
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