#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

enum {
	WIDTH = 1000,
	HEIGHT = 1000,
};

struct instr {
	signed char db;
	struct pos {
		unsigned short x, y;
	} start, end;
};

unsigned short read_be16(void *_buf)
{
	unsigned char *buf = _buf;
	return (buf[0] << 8) | buf[1];
}

bool read_instr(struct instr *i, FILE *f)
{
	unsigned char buf[9];
	signed char db;
	unsigned short v;

	assert(i != NULL);
	assert(f != NULL);

	if (fread(buf, sizeof buf, 1, f) != 1)
		return false;
	if (buf[0] <= 127)
		db = buf[0];
	else {
		db = -0x80;
		db += buf[0] - 0x80;
	}
	if (db < -1 || db > 2) {
		fprintf(stderr, "this db is crazy: %d -> %d\n", buf[0], db);
		return false;
	}
	i->db = db;

#define SET(f, p) { \
		v = read_be16(&buf[p]); \
		if (v > 999) \
			return false; \
		i->f = v; \
	}
	SET(start.x, 1);
	SET(start.y, 3);
	SET(end.x, 5);
	SET(end.y, 7);

	return true;
}

int main(void)
{
	int screen[WIDTH][HEIGHT] = { 0 };
	unsigned long long total;
	struct instr i;
	FILE *f;

	f = fopen("inputbin", "rb");
	if (f == NULL)
		exit(EXIT_FAILURE);

	while (read_instr(&i, f)) {
		for (int y = i.start.y; y <= i.end.y; y++) {
			for (int x = i.start.x; x <= i.end.x; x++) {
				screen[x][y] += i.db;
				if (screen[x][y] < 0)
					screen[x][y] = 0;
			}
		}
	}

	fclose(f);

	total = 0;
	for (int y = 0; y < HEIGHT; y++)
		for (int x = 0; x < WIDTH; x++)
			total += screen[x][y];
	printf("%llu\n", total);
}