How many function parameters exist in the program?

Flowchart Main has $1$ variable $($integer fahrenheit$)$ and $6$ nodes. Node $1$ is the start node and points to node $2.$ Node $2$ code: farenheit $=$ Get next input Node $2$ points to node $3.$ Node $3$ code: FahrenheitToCelsius$(32)$ Node $3$ points to node $4.$ Node $4$ code: FahrenheitToCelsius$(78)$ Node $4$ points to node $5.$ Node $5$ code: FahrenheitToCelsius$(100)$ Node $5$ points to node $6.$ Node $6$ is the end node. Flowchart FahrenheitToCelsius has $1$ parameter variable $($float fahrenheit$),$ no return variable, and $3$ nodes. Node $1$ is the start node and points to node $2.$ Node $2$ code: Put $($fahrenheit $-32\mathrm{.}0)*5\mathrm{.}0/9\mathrm{.}0$ to output Node $2$ points to node $3.$ Node $3$ is the end node.