I am working on a project and this is a sample doubt from my project

```
a = int(input("Enter Atomic Number: ")
e1 = "Hydrogen"
e2 = "Helium"
e3 = "Lithium"

```

Now, the program must print `"Hydrogen"` `if a = 1` and it must print `"Helium"` `if a = 2`
Note that I must do it for whole 118 elements and cannot use if statements.