#include <stdio.h>
#include <stdlib.h>

double pole(double a,double b,double c)
{
double pole=a*b*c;
return pole;
}

int main()
{
 FILE *dane;
 double x,y,z;
 dane=fopen("dane","r");
 fscanf(dane,"%lf",&x);
 fscanf(dane,"%lf",&y);
 fscanf(dane,"%lf",&z);
 fclose(dane);
 printf("%lf",pole(x,y,z));
}