In the context of this series of interconnected finance-related queries and the additional information provided by the pretext, table data, and posttext from a company's financial filings, please provide a response to the final question. This may require extracting information from the context and performing mathematical calculations. Please take into account the information provided in the preceding questions and their answers when formulating your response:
Context: table of contents part ii , item 8 schlumberger limited ( schlumberger n.v. , incorporated in the netherlands antilles ) and subsidiary companies shares of common stock issued treasury shares outstanding . <table class='wikitable'><tr><td>1</td><td></td><td>issued</td><td>in treasury</td><td>shares outstanding</td></tr><tr><td>2</td><td>balance january 1 2001</td><td>667085793</td><td>-94361099 ( 94361099 )</td><td>572724694</td></tr><tr><td>3</td><td>employee stock purchase plan</td><td>2013</td><td>1752833</td><td>1752833</td></tr><tr><td>4</td><td>shares granted to directors</td><td>2013</td><td>4800</td><td>4800</td></tr><tr><td>5</td><td>shares sold to optionees</td><td>8385</td><td>1399686</td><td>1408071</td></tr><tr><td>6</td><td>balance december 31 2001</td><td>667094178</td><td>-91203780 ( 91203780 )</td><td>575890398</td></tr><tr><td>7</td><td>employee stock purchase plan</td><td>2013</td><td>2677842</td><td>2677842</td></tr><tr><td>8</td><td>shares granted to directors</td><td>2013</td><td>3500</td><td>3500</td></tr><tr><td>9</td><td>shares sold to optionees</td><td>10490</td><td>2243400</td><td>2253890</td></tr><tr><td>10</td><td>acquisition of technoguide</td><td>2013</td><td>1347485</td><td>1347485</td></tr><tr><td>11</td><td>balance december 31 2002</td><td>667104668</td><td>-84931553 ( 84931553 )</td><td>582173115</td></tr><tr><td>12</td><td>employee stock purchase plan</td><td>2013</td><td>2464088</td><td>2464088</td></tr><tr><td>13</td><td>shares granted to directors</td><td>2013</td><td>3500</td><td>3500</td></tr><tr><td>14</td><td>shares sold to optionees</td><td>1320</td><td>1306305</td><td>1307625</td></tr><tr><td>15</td><td>balance december 31 2003</td><td>667105988</td><td>-81157660 ( 81157660 )</td><td>585948328</td></tr></table> see the notes to consolidated financial statements 39 / slb 2003 form 10-k .
Conversations: 
q0: what were the number of shares issued to directors in 2001? 4800.0
q1: what was the number in 2002? 3500.0
Question: what is the sum number of shares?
Answer: