Problem 1. Experience Gaining

function solve(arr) {
    arr = arr.map(Number);

    let neededPoints = arr.shift();
    let battles = arr.shift();
    let totalPoints = 0;

     let num = 0;

    for (let i = 0; i < battles; i++) {

        if (i % 3 === 0) {
            totalPoints += (arr[i] + arr[i] * 0.15);
            num++;
        } else if (i % 5 === 0) {

            totalPoints += (arr[i] - arr[i] * 0.1);
            num++;
        } else {

            totalPoints += arr[i];
            num++;
        }


        if (totalPoints >= neededPoints || totalPoints === neededPoints) {
            console.log(`Player successfully collected his needed experience for ${num} battles.`);
            return;
        }
    }


        console.log(`Player was not able to collect the needed experience, ${(neededPoints - totalPoints).toFixed(2)} more needed.`);


}