def check_collision(l, r, l1, r1):
    if l > r1 or r < l1:
        return False
    else:
        return True

W, q = [int(i) for i in input().split()]

cmds = [[int(i) for i in input().split()] for _ in range(q)]

figures = []
levels = {}

for cmd in cmds:
    i = cmd[1:]
    if cmd[0] == 1:
        bottom = 0
        for j in sorted(figures, key=lambda x:x[3])[::-1]:
            if check_collision(i[0], i[1], j[0], j[1]):
                bottom = j[3]
                break

        figure = (i[0], i[1], i[2], bottom + i[2])
        figures.append(figure)
        l, r, h, top = figure
        size_x = r - l + 1
        for level in range(top, top - h, -1):
            levels[level] = levels.get(level, 0) + size_x
    else:
        print(levels.get(i[0], 0))