In mountaineering, running or cycling the **cumulative elevation gain** (aka total ascent) refers to **the sum of every gain in elevation** throughout an entire trip.

Note that when calculating this elevation gain, **elevation losses are not counted in this measure**.

When evaluating the difficulty of a hike, you should consider both the **total distance** of the hike as well as its **cumulative elevation gain**. Effectively, hiking 10 kilometres on flat land is significantly easier than hiking up and down a series of high peaks over the same distance.

In this challenge, we are going to write a Python script to help a hiker plan their journey by estimating the cumulative elevation gain of their planned hike.

Your Python script will need to:

- Ask the user to enter the altitude of the starting point of the trip,
- For each peak or pit on the planned journey, ask the user to enter the altitude of the peak/or peat,
- Automatically add-up all the corresponding elevation gains (and ignore elevation losses!)
- Output the cumulative elevation gain of the planned hike!

#### Python Challenge

Your challenge is to complete the Python code below…

#### Test Plan

Test # | Input Values | Expected Output | Actual Output |

#1 | Starting Altitude: 1800m 1 ^{st} Peak: 2100m1 ^{st} Pit: 1950m2 ^{nd} Peak: 2240mEnding Altitude: 1800m |
Cumulative Elevation Gain: 590m | |

#2 | Starting Altitude: 1500m 1 ^{st} Peak: 1850m1 ^{st} Pit: 1800m2 ^{nd} Peak: 2100m2 ^{nd} Pit: 1900m3 ^{rd} Peak: 2400m (End of Trek) |
Cumulative Elevation Gain: 1150m | |

#3 |

#### Solution...

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