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

int main(int argc, char ** argv)
{
	double tot = 0;
  
  while (argc-- > 1) {
    char * endptr;
    tot += strtod(argv[argc], &endptr);
    if (*endptr) {
      fprintf(stderr, 
        "trailing characters after argument #%d ('%s')\n", 
        argc, endptr);
    }
  }
  printf("%lf\n", tot);
  return (0);
}