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

#define MAX_NUM 1000000

char* LETTERS = "0123456789";


int digits(int* res, int num)
{
	int len = 0;
	while (num > 0) {
		len++;
		res = (int*)realloc(res, len * sizeof(int));
		res[len-1] = num % 10;
		num /= 10;
	}

	return len;
}


int main(int argc, char** argv)
{
	char* str;
	int* digs;
	int nums, j, result;
	int digit = 0, i = 0, num = 1;

	str = malloc(MAX_NUM * sizeof(int));
	digs = malloc(0 * sizeof(int));
	nums = digits(digs, num);

	while (digit < MAX_NUM) {
		str[digit] = digs[nums-1-i];
		digit++;
		i++;
		if (i == nums) {
			/* refill digs and reset i */
			num++;
			nums = digits(digs, num);
			i = 0;
			/* DEBUG
			printf("num = %d str = ", num);
			for (j=0; j<digit; j++)
				printf("%d", str[j]);
			printf("\n");
			*/
		}
	}

	result = str[0] *
		str[9] *
		str[99] *
		str[999] *
		str[9999] *
		str[99999] *
		str[999999];

	printf("The result is %d\n", result);
	return 0;
}