Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Bob wants to build a pyramid out of legos with 3 levels where the bottom level has 7 legos per side and each level has one less lego per side than the level below it. How many legos total will he need?

### Response:
First find the total number of legos on the bottom layer: 7 legos * 7 legos = <<7*7=49>>49 legos
Then move to the next layer: 7 legos - 1 lego = <<7-1=6>>6 legos
Now find the total number of legos on the second level: 6 legos * 6 legos = <<6*6=36>>36 legos
Then move to the top level: 6 legos - 1 lego = <<6-1=5>>5 legos
Now find the total number of legos on the top level: 5 legos * 5 legos = <<5*5=25>>25 legos
Now add the number of legos on each level to find the total number of legos: 25 legos + 36 legos + 49 legos = <<25+36+49=110>>110 legos
#### 110