monitor = 200system_unit = 500keyboard = 50mouse = 20
total_cost = monitor + system_unit + keyboard + mouse
print("Общая стоимость покупки трех компьютеров:", total_cost)
monitor = 200
system_unit = 500
keyboard = 50
mouse = 20
total_cost = monitor + system_unit + keyboard + mouse
print("Общая стоимость покупки трех компьютеров:", total_cost)