How would I find the current account balance?

Firm A Wages paid to employees 152 Taxes paid to government 166 Input purchased from Firm B 85 Input purchased from Firm C 65 Revenue received 539 Sold to Public (newly produced} 273 Sold to Firm B 64 Sold to a foreign country 120 Sold from inventory to Public 82 Unsold production 88 After-tax profit 71 Firm B Wages paid to employees 142 Taxes paid to government 80 Input purchased from Firm A 64 Input imported 51 Revenue received 554 Sold to Public (newly produced} 371 Sold to Firm A 85 Sold to Firm C 98 After-tax profit 217 Firm C Wages paid to employees 105 Taxes paid to government 111 Input purchased from Firm B 98 Revenue received 817 Sold to Public (newly produced} 452 Sold to Government 239 Sold to Firm A 65 Sold from inventory to Public 61 Unsold production 97 After-tax profit 503 Additional Information Government transfers 273 Interest on government's debt 75 Private Saving 142