01. Counter-Strike

function conterStrike(input) {
    let command,
        battleIndex,
        count = 0,
        index = 0,
        energy = Number(input[index++]);

    while ((command = input[index++]) != "End of battle") {
        battleIndex = command;
        if (energy < battleIndex) {
            break;
        }
        count++;
        if (count % 3 == 0) {
            energy += count;
        }
        energy -= battleIndex;
    }

    if (command == "End of battle") {
        console.log(`Won battles: ${count}. Energy left: ${energy}`);
    } else {
        console.log(`Not enough energy! Game ends with ${count} won battles and ${energy} energy`);
    }

    return;
}