text: #include <stdio.h>
  #include <stdlib.h>
  
  int main(int argc, char ** argv) {
  	double mul = 1;
  	for (int i = 0; i < argc - 1; ++i) {
  		mul *= atof(argv[i + 1]);
  	}
  
  	printf("%.15g\n", mul);
  
  	return 0;
  }
  