01. Black Flag

function blackFlag(input) {
    let days = Number(input[0]);
    let dailyPlunder = Number(input[1]);
    let expectedPlunder = Number(input[2]);
    let totalPlunder = 0;

    for (let i = 1; i <= days; i++) {
        totalPlunder += dailyPlunder;
        if (i % 3 == 0) {
            totalPlunder += dailyPlunder * 0.5;
        }
        if (i % 5 == 0) {
            totalPlunder *= 0.7;
        }
    }

    if (totalPlunder >= expectedPlunder) {
        console.log(`Ahoy! ${totalPlunder.toFixed(2)} plunder gained.`);
    } else {
        console.log(`Collected only ${(totalPlunder / expectedPlunder * 100).toFixed(2)}% of the plunder.`);
    }
}