Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Round | Game | Date | Visitor | Score | Home | Score | OT |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Preliminary Round | Bye |  |  |  |  |  |  |
| Quarter-Finals | Game 1 | 13-Apr-75 | Chicago Black Hawks | 1 | Buffalo Sabres | 4 |  |
| Quarter-Finals | Game 2 | 15-Apr-75 | Chicago Black Hawks | 1 | Buffalo Sabres | 3 |  |
| Quarter-Finals | Game 3 | 17-Apr-75 | Buffalo Sabres | 4 | Chicago Black Hawks | 5 | (OT) |
| Quarter-Finals | Game 4 | 20-Apr-75 | Buffalo Sabres | 6 | Chicago Black Hawks | 2 |  |
| Quarter-Finals | Game 5 | 22-Apr-75 | Chicago Black Hawks | 1 | Buffalo Sabres | 3 |  |
| Semi-Finals | Game 1 | 27-Apr-75 | Montreal Canadiens | 5 | Buffalo Sabres | 6 | (OT) |
| Semi-Finals | Game 2 | 29-Apr-75 | Montreal Canadiens | 2 | Buffalo Sabres | 4 |  |
| Semi-Finals | Game 3 | 1-May-75 | Buffalo Sabres | 0 | Montreal Canadiens | 7 |  |
| Semi-Finals | Game 4 | 3-May-75 | Buffalo Sabres | 2 | Montreal Canadiens | 8 |  |
| Semi-Finals | Game 5 | 6-May-75 | Montreal Canadiens | 4 | Buffalo Sabres | 5 | (OT) |
| Semi-Finals | Game 6 | 8-May-75 | Buffalo Sabres | 4 | Montreal Canadiens | 3 |  |
| Stanley Cup Finals | Game 1 | 15-May-75 | Buffalo Sabres | 1 | Philadelphia Flyers | 4 |  |
| Stanley Cup Finals | Game 2 | 18-May-75 | Buffalo Sabres | 1 | Philadelphia Flyers | 2 |  |
| Stanley Cup Finals | Game 3 | 20-May-75 | Philadelphia Flyers | 4 | Buffalo Sabres | 5 | (OT) |
| Stanley Cup Finals | Game 4 | 22-May-75 | Philadelphia Flyers | 2 | Buffalo Sabres | 4 |  |
| Stanley Cup Finals | Game 5 | 25-May-75 | Buffalo Sabres | 1 | Philadelphia Flyers | 5 |  |
| Stanley Cup Finals | Game 6 | 27-May-75 | Philadelphia Flyers | 2 | Buffalo Sabres | 0 |  |
Question:
how many games went into ot or overtime?
Answer:
4