def main():
    age_counter()

def age_counter():
    x = input()
    x = x.split()
    m = x[0]
    d = x[-1]
    if len(d) == 1:
        d = '0' + d
    bd = m + d
    if int(bd) >= 822:
        print('24')
    else:
        print('23')
    
if __name__ == '__main__':
    main()