01. Black Flag

days = int(input())
daily_plunder = int(input())
expected_plunder = float(input())
total_plunder = 0.0

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

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