Simba Travel Agency arranges trips for climbing Mount Kilimanjaro. For each trip, they charge an initial fee of \$100$100dollar sign, 100 in addition to a constant fee for each vertical meter climbed. For instance, the price for climbing to the Shira Volcanic Cone, which is 300030003000 meters above the base of the mountain, is \$400$400dollar sign, 400.

Let F(d)F(d)F, left parenthesis, d, right parenthesis denote the fee of a trip FFF (measured in dollars) as a function of the vertical distance climbed ddd (measured in meters).

Write the function's formula.