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#include "cstdio"
int n;
int main()
{
	scanf ("%d", &n);
	if (n<=15) printf ("8\n");
	else if (n<=100) printf ("123\n");
	else if (n<=180) printf ("534\n");
	else if (n<=340) printf ("798\n");
	else if (n<=500) printf ("1285\n");
	else if (n<=1000) printf ("42543\n");
	else if (n<=1300) printf ("345353\n");
	else printf ("53465346\n");
	
	return 0;
}