pycharmprog

import math
from typing import List


def parse_input_token(string, token) -> List[float]:
    result = string.split(token)
    if len(result) == 2:
        result = [float(v) for v in result]
        result.sort()
        return result
    return []
def parse_input(string):
    for token in ["x", "*", " "]:
        v = parse_input_token(string, token)
        if v: return v
    return None
def main():
    roll_width, roll_length = parse_input(input())
    roll_sq = roll_width * roll_length
    total_wall_sq = 0
    while True:
        value = input()
        if value == "стоп":
            break
        wall_width, wall_length = parse_input(value)
        total_wall_sq += wall_width * wall_length
    print(f"Площадь обрабатываемой поверхности: {total_wall_sq}")
    roll_amount = math.ceil(total_wall_sq / roll_sq)
    total_roll_sq = roll_amount * roll_sq
    print(f"Общая площадь закупаемого материала: {total_roll_sq}")
    print(f"Количество рулонов закупаемого материала: {roll_amount}")
    over_sq_percent = 100 * ((total_roll_sq - total_wall_sq) / total_wall_sq)
    print(f"Излишек материалов: {over_sq_percent}%")
main()