#include <stdio.h>
#include <math.h>
#include <stdlib.h>
double floor(double arg); //proto
int main(int argc , char *argv[]){
  //  printf("%d",argc);
  if(argc!=4){
   printf("Expected 3 arguments : year month day  \n");
   exit(-1);
  }
  
  int year=atoi(argv[1]),month=atoi(argv[2]),day=atoi(argv[3]);
  const int JGREG=15+31*(10+12*1582);
  int julianYear = year;
  if(year<0)julianYear++;
  int julianMonth=month;
  if(month>2)
    julianMonth++;
  else{
    julianYear--;
    julianMonth+=13;
  } double julian = (floor(365.25 * julianYear)+ floor(30.6001*julianMonth) + day + 1720995.0);
  if(day+31*(month+12*year)>=JGREG){
    int ja=(int)(0.01*julianYear);
    julian += 2-ja+(.25*ja);
  }
  printf("Julian date is %f\n",julian);
  
   return 0;
}