Black Flag

days = int(input())
daily_plunder = int(input())
expected_plunder = float(input())
total = 0

for day in range(1, days + 1):
    total += daily_plunder
    if day % 3 == 0:
        total += daily_plunder * 0.5
    if day % 5  == 0:
        total *= 0.7

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