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

int main(int argc, char *argv[])
{
  double x, y, z, a;
  printf("x=");
  scanf("%lf=", &x);
  
  printf("y=");
  scanf("%lf=", &y);

  printf("z=");
  scanf("%lf=", &z);
  
  if (((z-(int)(z/M_PI)*M_PI)!=0) && ((log(fabs(z))!=-(sqrt(exp(x*y))))));
   
  a=((fabs(x)+cos(y)-sin(z))/(sqrt(exp(x*y)))+(log(fabs(tan(z)))));
 
  printf(" A = %lf\n ", a); 
    system("PAUSE"); 
return 0;
}