#include<stdio.h>
#define c1 1e5*10e-2
#define c2 (2e5-1e5)*7.5e-2
#define c3 (4e5-2e5)*5e-2
#define c4 (6e5-4e5)*3e-2
#define c5 (1e6-6e5)*1.5e-2
int main()
{
	int a, b;

	scanf("%d", &a);
	if (a >= 0)
	{
		if (a <= 1e5)
			b = a * 10e-2;
		else if (a > 1e5 && a <= 2e5)
			b = c1 + (a - 1e5) * 7.5e-2;
		else if (a > 2e5 && a <= 4e5)
			b = c1 + c2 + (a - 2e5) * 5e-2;
		else if (a > 4e5 && a <= 6e5)
			b = c1 + c2 + c3 + (a - 4 * 1e5) * 3e-2;
		else if (a > 6e5 && a <= 1e6)
			b = c1 + c2 + c3 + c4 + (a - 6e5) * 1.5e-2;
		else
			b = c1 + c2 + c3 + c4 + c5 + (a - 1e6) * 1e-2;
	}
	else if(a<0)
		printf("error\n");
	printf("%d", b);
	return 0;
}