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

int gcd (int a, int b) {
  printf("El MCD de a = %d y b = %d es ",a,b); 
	while (a != b) {
	  if (a > b) {
		  a = a - b;
		} else {
		  b = b - a;
		}
	}
	printf("%d.\n",a);
}

main (int argc, char **argv) {
  gcd(atoi(argv[1]),atoi(argv[2]));
}