add 3 numbers

Here's a simple Python program that adds three numbers:

```python
# Define the numbers to be added
num1 = 10
num2 = 20
num3 = 30

# Add the numbers
result = num1 + num2 + num3

# Print the result
print("The sum of", num1, num2, "and", num3, "is:", result)
```

When you run this program, it will output:

```
The sum of 10 20 and 30 is: 60
```

Alternatively, you can use a function to add the numbers:

```python
def add_numbers(num1, num2, num3):
    return num1 + num2 + num3

num1 = 10
num2 = 20
num3 = 30

result = add_numbers(num1, num2, num3)
print("The sum of", num1, num2, "and", num3, "is:", result)
```

This will produce the same output as the previous example.