#include <stdio.h>

int main()
{
	double consumption;
	double bill = 0.0;

	printf("Enter consumption: ");
	scanf("%lf", &consumption);

	if (consumption <= 100)
	{
		bill = 0.01 * consumption;
	}
	else if (consumption <= 300)
	{
		bill = 1 + 0.03 * (consumption - 100);
	}
	else if (consumption <= 800)
	{
		bill = 1 + 6 + 0.05 * (consumption - 300);
	}
	else
	{
		bill = 1 + 6 + 25 + 0.07 * (consumption - 800);
	}

	printf("Bill = %lf\n", bill);
}