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

int veletlen(int n) {
	unsigned int vel;
	FILE *f;
   
	f = fopen("/dev/urandom", "r");
	fread(&vel, sizeof(vel), 1, f);
	fclose(f);
  
	return vel % n;
}

int main() {
	printf("%d\n", veletlen(6));
}