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

#define EXIT_ERROR -1
extern int errno;
int example(int,int);

int main(int argc, char *argv[]){

	int arg1,arg2,ret;

	/*argv[1] should be a number*/
	if(argc != 3){
		printf("Usage: %s inputNumber1 inputNumber2\n",argv[0]);
		return EXIT_ERROR;
	}

	arg1 = strtol(argv[1],NULL,10);
	if(errno == ERANGE || errno == EINVAL){
		fprintf(stderr,"ERROR:You must enter a valid integer\n");
		return EXIT_ERROR;
	}
	arg2 = strtol(argv[2],NULL,10);
	if(errno == ERANGE || errno == EINVAL){
		fprintf(stderr,"ERROR:You must enter a valid integer\n");
		return EXIT_ERROR;
	}

	ret = example(arg1,arg2);

	printf("example(%d,%d)=%d\n",arg1,arg2,ret);

	return ret;
}

int example(int arg1,int arg2){
	int a,b,c;

	a = arg1 *2;
	b=15213;
	c = arg2 + b;

	b = b + a;
	b = b + c; 
	a = arg1 * arg2;
	
	return (b >> 2) + a;
}