days_plunder = int(input())
daily_plunder = int(input())
expected_plunder = float(input())
d = 0

for i in range(1, days_plunder+1):
    if i % 5 == 0:
        d -= d * 0.3
        continue
    if i % 3 == 0:
        d += (daily_plunder * 1.5) + daily_plunder
        continue
    d += daily_plunder

if d >= expected_plunder:
    print(f'Ahoy! {d:.2f} plunder gained.')
else:
    print(f'Collected only {(d * 100) / expected_plunder:.2f}% of the plunder.')