"""
while True:
    inp = raw_input('Age?')
    if inp.lower() == 'stop':
        break
    elif not inp.isdigit():
        print 'Bad!' * 8
    else:
        print float(inp) ** 2
"""

while True:
    inp = raw_input('Age?')
    if inp == 'stop': break
    try:
        print float(inp) ** 2
    except:
        print 'Bad!' * 8