$**$A company has the based$-$existing customers achieving $3000$ customers. In $2022,$ the report from R&D department indicates that $2250$ potential customers are expected to purchase the products. In order to maintain the existing customers and approach the new ones, sales team starts their cold canvassing with the $5$ calls per year for $2$ hours$/$each call $($including travelling expense$).$ Generally, the company recognizes the available selling time per salesperson is $1000$ hours. What is the sale force size?$**$