#include <stdio.h>
#include <math.h>

void main(void)
{
	unsigned int x_point[100], y_point[100];
	int lenght = 0, amount = 0;

	for (int i = 0; i < 100; i++)
	{
		printf("point %d: enter xi\n", i + 1);
		scanf("%d", &x_point[i]);

		printf("point %d: enter yi\n", i + 1);
		scanf("%d", &y_point[i]);
		
	}

	for (int i = 0; i < 99; i++)
	{
		if (x_point[i] > 0 && x_point[i + 1] < 0)
			amount++;
		if (x_point[i] < 0 && x_point[i + 1] > 0)
			amount++;
		if (y_point[i] > 0 && y_point[i + 1] < 0)
			amount++;
		if (x_point[i] < 0 && x_point[i + 1] > 0)
			amount++;

		lenght += sqrt(abs(x_point[i + 1] - x_point[i]) * abs(x_point[i + 1] - x_point[i]) + abs(y_point[i + 1] - y_point[i]) * abs(y_point[i + 1] - y_point[i]));
	}

	printf("amount: %d", amount);
	printf("lenght: %d", lenght / 100);

	return;
}