function exam(input) {
    let numGrade= +input.shift();
    let countBadgrade = 0;
    let counter = 0;
    let allGrade = 0;

    while (countBadgrade < numGrade) {
        let name = input.shift();
        let currGrade = +input.shift();
        let lastGrade = allGrade / counter
        allGrade += currGrade;
        if (currGrade <= 4) {
            countBadgrade++;
        }


        if (name == "Enough") {

            console.log(`Average score: ${Math.abs(lastGrade.toFixed(2))}\nNumber of problems: ${counter}\nLast problem: ${name}`)
            break;
        }
        counter++;
    }
    if (countBadgrade >= numGrade) {
        console.log(`You need a break, ${countBadgrade} poor grades.`)
    }


}