import sys
import time

time.sleep(float(sys.argv[1]))

concatenated = ''

if len(sys.argv) > 3:
    for filename in sys.argv[2:-1]:
        with open(filename, 'r') as file:
            concatenated += file.read()

    with open(sys.argv[-1], 'a') as out:
        out.write(concatenated)
