"""
while True:
    ans = raw_input('Enter age: ')
    if ans == 'stop':
        break
    elif ans.isdigit():
        print int(ans) ** 2
    else:
        print 'Bad!' * 8
print 'bye'
"""

while True:
    ans = raw_input('Enter age: ')
    if ans == 'stop': break
    try:
        print float(ans) ** 2
    except:
        print 'Bad!' * 8
print 'bye'