Train The Trainers JS

function trainTheTrainers(input) {
    let index = 0;
    let juryNumber = Number(input[index]);
    index++;

    let presentationName = input[index];
    index++;

    let counter = 0;
    let totalPresentationGrades = 0;
    while (presentationName !== "Finish") {
        counter++;

        let presentationGrade = 0;
        for (let i = 1; i <= juryNumber; i++) {
            let grade = Number(input[index]);
            index++;
            presentationGrade += grade;
        }
        let averagePresentationGrade = presentationGrade / juryNumber;
        console.log(`${presentationName} - ${averagePresentationGrade.toFixed(2)}.`);

        totalPresentationGrades += averagePresentationGrade;
        presentationName = input[index];
        index++;
    }
    if (presentationName === "Finish") {
        console.log(`Student's final assessment is ${(totalPresentationGrades / counter).toFixed(2)}.`);
    }
}