function graduation(input) {
    let name = input.shift();
    let counter = 0;
    let gradeTotal = 0;
    let grade = +(input.shift());
    let average = 0;
    while (grade > 0 || grade === NaN) {
        counter++;
        gradeTotal += grade;
        grade = +(input.shift());

    }
    average = gradeTotal / counter;
    if (average >= 4) {
        console.log(`${name} graduated. Average grade: ${average.toFixed(2)}`)
    }
}
graduation(["Pesho", 4, 5.5, 6, 5.43, 4.5, 6, 5.55, 5, 6, 6, 5.43, 5, 6]);