The table below show the customers an arcade had leading up to the weekend.
| Day | Customers |
| Tuesday | 154 |
| Wednesday | 105 |
| Thursday | 122 |
| Friday | 140 |
| 521 |
Over the weekend they had 6 times as many customers as they did before in the previous 4 days. How many more customers did they have over the weekend than they had in the previous 4 days?