import pandas as pd

n_users = 50000
revenue_per_user = 10

var_costs = pd.Series({
    'marketing': 200000,
    'servers': 200000
})

fixed_costs = pd.Series({
    'salaries': 300000,
    'rent': 150000
})

revenue = n_users * revenue_per_user
total_costs = var_costs.sum() + fixed_costs.sum()

print('Выручка:', revenue)
print('Затраты:', total_costs)
print('Итого:', revenue - total_costs)