Train The Trainers - Nested Loops

function trainTheTrainers(input) {

    let n = Number(input[0]);
    let index = 1;
    let command = input[index];

    let sumGrades = 0;
    let counter = 0;

    while (command !== 'Finish') {
        counter++;
        let name = command;
        let tempSumGrades = 0;

        for (let i = 0; i < n; i++) {
            index++;
            let grade = Number(input[index]);
            tempSumGrades += grade;
        }
        let tempAvgGrade = tempSumGrades / n;
        sumGrades += tempAvgGrade;

        console.log(`${name} - ${tempAvgGrade.toFixed(2)}.`);

        index++;
        command = input[index];
    }
    let avgGrade = sumGrades / counter;

    console.log(`Student's final assessment is ${avgGrade.toFixed(2)}.`);

}

trainTheTrainers(["2", "While-Loop", "6.00", "5.50", "For-Loop", "5.84", "5.66", "Finish"])